Điện nghiệm là dụng cụ để phát hiện một vật nhiễm điện. Điện nghiệm gồm một thanh kim loại đặt trong một bình thủy tinh, đầu dưới của thanh có treo hai lá kim loại mỏng giống nhau. Hãy nêu hiện tượng và giải thích khi đưa một thanh nhựa nhiễm điện do cọ xát chạm vào đầu trên của điện nghiệm.

Bài 2. Đặt thanh thủy tinh lên trục quay sau khi đã được cọ xát bằng mảnh vải khô. Đưa mảnh vải này lại gần đầu thanh thủy tinh được cọ xát thì chúng hút nhau. Biết rằng mảnh vải cũng bị nhiễm điện, hỏi mảnh vải mang điện tích dương hay điện tích âm? Tại sao?

III. Điền vào chỗ trống trong các câu sau với từ thích hợp trong khung.

seafood crabs souvenirs

sharks dolphins food stall

1. The children like to see the__________ in the aquarium.

2. People are afraid of__________ when they are at sea.

3. After visiting the aquarium, people went to the__________ for lunch.

4. I often buy a lot of__________ for my friends at home.

5. When my family go to the beach, we usually eat__________.

6. My favorite seafood is__________.

IV. Điền dạng đúng của động từ trong ngoặc.

1. Nam and his classmates (play) __________ soccer yesterday afternoon.

2. He (send) __________ a letter to his pen pal last week.

3. Mrs. Hong (teach) __________ us English last year.

4. Barbara (wear) __________ a very beautiful dress last night.

5. Lan (write) __________ to her grandparents more often last year.

6. His father often (work) __________ in the garden on Sunday mornings.

7. The teacher usually (give) _________ the students a lot of homework on the weekend.

8. Tourists often (go) __________ to eat seafood at that famous restaurant.

V. Điền dạng đúng của động từ trong ngoặc.

Last Sunday, students from my school (1. go) ______ on an excursion. We (2. visit) ________ Cu Chi Tunnel. We (3. come) ______ to school at 6 a.m. Ten big buses (4. take) ______us there. All of us (5. be) ______ excited, so we (6. sing) ______ all the way to Cu Chi. We (7. arrive) ________ there at 7 a.m. A tourist guide (8. show) _______ us the historical places: the long tunnel and the kitchen under the ground where people (9. cook) _____ their meals. We (10. make) _______a tour round that place. Then we (11. go)_______ to Ben Duoc Temple. We (12. see) ______lots of names of the soldiers on the walls. We (13. admire)_____ them very much. Our teacher (14. ask) _____ us to write a report. We (15. write) _____ it at the moment. We (16. feel) _____ very happy to write what we (17. 1earn) _______ from that trip. We hope we (18. come) _______ back to Cu Chi some day.

VI. Viết câu hỏi cho các từ gạch dưới trong các câu sau.

1. I went to bed at 11 o'clock last night.

=> .........................................................................................................

2. She bought that dictionary because she didn't know many English words.

=> .........................................................................................................

3. I sent these letters to my pen pal in Canada.

=> .........................................................................................................

4. Lan went to Nha Trang last month.

=> .........................................................................................................

5. She went to Nha Trang by train.

=> .........................................................................................................

6. They saw many types of fish and turtles in the aquarium.

=> .........................................................................................................

7. I ate bread and eggs for breakfast this morning.

=> .........................................................................................................

8. They were in the countryside last summer.

=> .........................................................................................................

VII. Sắp xếp các từ sau để thành câu hoàn chỉnh.

1. short/ stopped/ the/ they/ at/my restaurant/ for/ time/ a.

=> .........................................................................................................

2. bought/ made/ mother/ dress/ material/ my/ and/ me/ the/ a/ for.

=> .........................................................................................................

3. apartment/ door/ mine/ they/ an/ to/ rented/ next.

=> .........................................................................................................

4. first/ saw/ shark/ time/ she/ this/ the/ a / is.

=> .........................................................................................................

5. wrote/ often/ year/ letters/ pen pal/ to/I / my/ last.

=> .........................................................................................................

6. taught/ some/ she/ friends/ her/ Vietnamese.

=> .........................................................................................................

7. summer/ visit/ you/ Hanoi/ last/ did/ vacation?

=> ........................................................................................................

III.CHOOSE THE MOST APPROPRIATE ANSWER TO COMPLETE THE SENTENCE BELOW

1. Trung bought some goldfish and kept them in an_______________.

A. aquarium B. envelope C. river D. umbrella

2. “Thanks a lot.” – “_______________”

A. You’re welcome. B. That’s right! C. That’s OK D. I’d love to.

3 Hi, Liz. Welcome back. How ……………….. your vacation in Nha Trang ?

A. are B. is C. was D. were

4. We should have a medical...........................every six months.

A. treatment B. record C. problem D. check-up

5. Moderation in eating is the _______to a healthy lifestyle.

A. important B. key C. door D. advice

6. Most of the world’s surface is____________( land / mountains / water / rivers )

7. Hoa feels sick. She ate too _____________candy last night.

A. much B. many C. a lot of D. More

9. Do you help your parents ________________the housework?

A. for B. abou C. to D. with

10. Tom likes volleyball,.........his brother doesn’t.His brother likes soccer.

A.and B.so C.but D.or

12. Walking is a good sports..............It makes us ...........

A.game-healthy B.game-health C.activity-healthy D.activity-health

13. Driving fast in a big city is very_______________.

A. happy B. easy C. dangerous D. careless

14. He explained the words ____________, but they did not understand at all.

A. clear B.hardly C. bad D. clearly

15. She _________ the beef thinly before stir-frying it in a little vegetable oil.

A. boiled B. sliced C. added D. cooked

16“_______________” – “I feel terrible.”

A. What would you like to do? B. Why didn’t you go to school yesterday? C. What was wrong with you? D. What’s the matter?

17. _____________ to have dinner at my house? – Yes. I’d love to.

A. Do you like B. Would you like C What about D. Should We

18. What was ____________ with her ?

A. matter B. problem C. wrong D. symptom

20. Don’t forget ……………….. off the lights before going out.

A. to turn B. turned C. turning D. turn

21. Every day, I get up early to ………………. morning exercises.

A. do B. make C. take D. A & C are correct

22 We can learn more about the undersea thanks ………………………… this invention. A. in B. on C. of D. to

23. The medicines you take only relieve the ________.

A. temperature B. cold C. symptoms D. cure

24. Don’t eat this durian. It’s not _________________.

a. good b. green c. ripe d. cool

26. ........... is a condition of the body when it is too hot because of illness.

A. Cold B. Fever C. Cough D. Flu

27. I’d like _________ by listening to music at breaktime

A. relaxed B. relaxing C. to relax D. relax

28. “I didn’t like the film.” – “ _____________”

A. We did, either. B. Neither did we. C. We didn’t, too. D. So did we.

30. I ‘ve got a headache.-................................................

A.You must take some medicine B.You mustn’t stay in bed C.You ought to stay up late D.You shouldn’t take a rest A B C

IV. Complete the passage, using the words given in the box any, far, new, years, from, by, live, in, with, motorbike Lan is our (1)______ classmate. She comes (2) _____ Nha Trang. She is (3) ____ class 7A. She is thirteen (4) _____ old. Her parents (5) ______ in Nha Trang. Now she’s living (6) _____ her aunt and uncle in HCM city. Her house is (7) ____ from school. So, she usually goes to school (8)____ bus. a. Cleaning floor day. b. Caution wet floor. c. Wet floor ahead. d. Keeping out of floor 29. Khang and I _________ swim when we were only five years old. A. should B. could C. can D. must IV. Complete the passage, using the words given in the box any, far, new, years, from, by, live, in, with, motorbike Lan is our (1)______ classmate. She comes (2) _____ Nha Trang. She is (3) ____ class 7A. She is thirteen (4) _____ old. Her parents (5) ______ in Nha Trang. Now she’s living (6) _____ her aunt and uncle in HCM city. Her house is (7) ____ from school. So, she usually goes to school (8)____ bus. Sometimes, her aunt takes her to school by (9) _______. She doesn’t have (10) _____ friends. So she feels sad. V. Write in the correct order to have meaningful sentence

1. on/ may/ Lan/ be/ will/ Sunday/ 25th/ 13

. ……………………………………………………………

2. Call/ six/ will/ I/ after/ o’ clock/ again/her.

……………………………………………………………

3. speak/ can/?/ I/ Van/ to/ please.

……………………………………………………………

4. you/ free/ morning/ be/ will/ tomorrow/?

……………………………………………………………

5. parents/ Thu/ with/ in/ lives/ Hanoi/ her.

……………………………………………………………

I- Choose the best answer :

1. She talked to her friends ………. Her vacation in Dalat. (in - about- on - with)

2. I ……………… very happy on my last vacation. (will be - am - was -were)

3. It was a green skirt with white flowers ………………… it. (in - on - at - to)

4. We like …………………… together. (talk - to talk - talking - talked)

5. He …………………… here tomorrow. (don’t - didn’t - won’t - wasn’t)

6. … you go and see her? Because was sick. (When – Where- What time - Why)

7. …………………… a nice dress! (How - Who - What - Which)

8. We enjoy ………… around the world.( traveled - traveling - to travel - travel)

9. What will you …………… during your vacation? (did - do - does - doing)

10. She needed …………………… these post cards to her friends. ( to sent - sending - sent - send)

II. Give the past form of these verbs:

1.arrive

2.remember

3.return

4.rent

5.receive

6.move

7.watch

8.learn

9.decide

10.stop

11.have

12.be

13.go

14.buy

15.take

16.see

17.wear

18.eat

19.think

20.put

21.give

22.teach

23.make

24.do

III.Arrange the words into the correct order to make the sentence

1.tell/ to/ nearest/ you/ the way/ bus stop / could / me / the ?

2.be/ won’t/ to/ keep/ it/ difficult/touch/ in

3.to/ Ha Noi/by / the / returned/ Robinsons/bus.

4.in/ souvenir / what/ buy/ shop/did/the/ they?

5.decided/ learn / sew/ she / how/ to/ to/ .

6.my/ me/ neighbor/ made/ bought/the/ the/ material/dress/ for /and.

IV. Change into the negative and interrogative form

1.She enjoyed her last summer holiday.

2.Hoa made a cushion for her armchair.

3.They painted the house yellow.

4.I was late for school.

5.Mr Lee took the children to the museum last Sunday

6.She talked to her friends about her vacation in Dalat.

7.They were at the party last night.

8.Mr Quang taught Maths in high school for many years.

V. Rewrite the sentences

1.Let’s go to the cafeteria.

What about___________________?

2.They returned to America two weeks ago

3.She went to the doctor because she was sick

4.She likes History most

Her_________________________

5.Do you want to come?

Would_________________________

6.We will have a vacation that lasts for three months.

We will have a___________________

7. What about having dinner in the restaurant?

Why don’t______________________?

8.He spent two hours doing his homework.

He took__________________________

Bạn Long đi bộ từ nhà đến trường với vận tốc 4 km/giờ mất 21 phút. Nếu bạn Long đi xe đạp từ nhà đến trường với vận tốc 14 km/giờ thì sẽ mất bao nhiêu phút?

-Quan sát lược đồ Châu Mỹ ở trang 17 sách “Tập bản đồ Địa lý 7”:

a-Châu Mỹ tiếp giáp với các đại dương nào?

b-Kể tên các biển của châu Mỹ? Các biển này thuộc về đại dương nào?

c-Kể tên các vịnh của châu Mỹ? Theo em, vịnh nào có diện tích lớn nhất?

2-Đọc thông tin trong SGK Địa lý 7 (trang 109-112) và trả lời các câu hỏi:

a-Chủ nhân đầu tiên của châu Mỹ là ai? Họ thuộc chủng tộc nào? Nguồn gốc thực sự của họ có phải ở châu Mỹ không? Tại sao?

b-Người Anh-điêng đã đạt tới trình độ phát triển như thế nào?

c-Người da đen bị đưa sang châu Mỹ trong hoàn cảnh nào? Vì mục đích gì?

d-Tại sao ở châu Mỹ lại có rất nhiều người lai?