Choose the best answer:

1) I ... my friends since I ... school.

A. have met/ have left

B. haven't met/ left

C. met/ have left

D. didn't met/ have left

2) Environmental pollution can do harm ... our health and kill many living creatures?

A. to

B. on

C. from

D. of

3) If he ... playing video games, he will fail in his examination.

A. keep

B. will keep

C. keeps

D. kept

4) ... are the result of an abrupt shift in the underwater movement of the Earth.

A. Earthquakes

B. Tidal waves

C. Typhoons

D. Volcanoes

5) ... Easter, many children and adults enjoy painting eggs.

A. On

B. At

C. For

D. In

6) Many people were injured when the building ... .

A. collasped

B. destroyed

C. struck

D. erupted

7) The man and elephants ... come from Africa can live until they're seventy.

A. which

B. whose

C. who

D. that

8) Energy can be collected by solar ... on cloudy days.

A. boards

B. panels

C. bars

D. sheets

9) There's nothing good on TV. Why don't you turn it ...?

A. on

B. down

C. off

D. up

10) Lan spoke ... English after she lived in England for several months.

A. natural

B. naturally

C. good

D. well

Choose the correct answer A, B, C or D to complete the sentences:

1) Christians usually have a special dinner ... Christmas Day.

A. in

B. for

C. at

D. on

2) James is looking ... his blue shirt everywhere. Have you seen it?

A. after

B. up

C. for

D. at

3) A tornado lifted a baby into the air and ... safely 100 meters away.

A. let it off

B. suck it up

C. put it down

D. take it on

4) Mr. Wilson, ... yesterday, teaches chemistry.

A. which I met

B. that I met

C. whom I met

D. with whom I met

5) Family is always my father's top ... . It is the most important to him.

A. speciality

B. right

C. priority

D. privacy

6) ... it is raining again, we will have to stay at home.

A. While

B. As

C. Even though

D. Unless

7) Don't forget to bring my dictionary when you ... back tomorrow.

A. come

B. will come

C. would come

D. are coming

8) The air in the city ... with traffic fumes.

A. is heavy polluted

B. is polluted heavy

C. is heavily polluted

D. polluted heavily

9) "Can I give you a cup of tea?" - "... ."

A. That would be nice.

B. Of course you can.

C. Well, I'd like to.

D. That's a good idea.

10) "Congratulations to you on winning the first prize." - "... ."

A. You're welcome.

B. Thanks a lot.

C. It doesn't matter.

D. I'm glad to hear that.

Choose the word or phrase (A, B, C or D) that best fits the blank space in each sentence:

1) We were prevented ... entering the building.

A. for

B. off

C. by

D. from

2) Oil and gas ... for 60% of our exports.

A. pay

B. account

C. call

D. place

3) The hotel ... a shoe-cleaning service for guests.

A. provides

B. gives

C. lends

D. offers

4) Mrs. Xuan, ... youngest child has just won the first prize in the English Speaking contest, feels very happy now.

A. her

B. who

C. whom

D. whose

5) We won't go camping near that river ... it is seriously polluted.

A. when

B. as

C. but

D. and

6) "I suggest taking a shower instead of a bath to save energy." - "... ."

A. Yes, I do.

B. I certain will.

C. Don't worry.

D. Great! Let's do that.

7) A: "Let me congratulate you on your new house" - B: "... ."

A. No, thanks

B. Thanks

C. Good

D. You're welcome

8) Excuse me! I'm doing my homework. ... turning down your radio a bit?

A. Would you please

B. Can you

C. Could you

D. Would you mind

9) The water company will have to ... water supplies while repairs to the pipes are carried out.

A. take off

B. set off

C. cut off

D. break off

Choose the word or phrase (A, B, C or D) that best fits the blank space in each sentence:

1) Viet Nam is a tropical country ... has a lot of beautiful places.

A. it

B. where

C. which

D. what

2) I suggest that you ... the dripping faucet.

A. to fix

B. fixed

C. fix

D. could fix

3) Susan is very tired. ..., she tries to finish her homework.

A. However

B. Therefore

C. But

D. Since

4) On Passover, people celebrate ... from slavery.

A. dependence

B. freedom

C. happiness

D. parades

5) When a tropical ... reaches 120 kph, it is called typhoon.

A. rain

B. wind

C. cloud

D. storm

6) What will you say if you ... Carol?

A. meet

B. to meet

C. will meet

D. will be met

7) Everybody must take part in ... deforestation.

A. innovating

B. preventing

C. providing

D. conserving

8) You should have the water pipes in your house ... regularly.

A. check

B. checked

C. to check

D. checking

9) What are you complaining ...?

A. about

B. to

C. on

D. for

10) "I passed the final test, Mom." - "... ."

A. Thank you

B. Good luck

C. All right

D. Well done

Cho 120 gam dung dịch axit axetic có nồng độ 5% tác dụng vừa đủ với dung dịch K₂CO₃ có nồng độ 8%.

a) Viết phương trình phản ứng hóa học.

b) Tính khối lượng dd K₂CO₃ đã tham gia phản ứng.

c) Tính nồng độ phần trăm của dd muối thu được sau phản ứng.

Đốt cháy hoàn toàn 8,96 lít (đktc) khí axetilen.

a) Viết PTHH xảy ra.

b) Tính thể tích oxi cần dùng, thể tích CO₂ thu được (các khí đo ở đktc).

c) Tính thể tích không khí cần dùng để đốt cháy lượng khí ở trên, biết khí oxi chiếm 20% thể tích không khí.

d) Dẫn toàn bộ sản phẩm sau khi đốt cháy vào bình chứa dd Ba(OH)₂ dư thì thu được bao nhiêu gam kết tủa?

1) Nêu phương pháp hóa học để nhận biết lần lượt 3 khí là: Axetilen, metan, cacbonic. Viết PTHH (nếu có).

2) Bằng phương pháp hóa học, trình bày cách nhận biết các lọ chất khí mất nhãn sau: khí metan, khí etylen, khí hidro. Viết phương trình phản ứng minh họa.

3) Bằng phương pháp hóa học, hãy nhận biết 3 chất lỏng sau: Rượu etylic, benzen, axit axetic.

Cho pt: x² - (m - 2)x - m - 1 = 0 (với m là tham số)

a) Chứng tỏ phương trình trên luôn có 2 nghiệm phân biệt x₁, x₂ với mọi m.

b) Tìm m thỏa mãn hệ thức: (x₁ - x₂)² - 3x₁x₂ = 21

Cho hình vuông có cạnh bằng 1 cm. Trên đó dựng hai nửa đường tròn có đường kính là cạnh của hình vuông như hình vẽ. Hãy tính phần diện tích được tô màu.

Sentence transformation:

1) Because the picture is beautiful. Tom is looking at it.

→ Because of

2) Mr Pike is a teacher. We studied with him last year.

→ Mr Pike, whom

3) I am busy so I can't help you.

→ If

4) My French friend finds driving on the left difficult.

→ My French friend isn't

5) She is trying to find her lost earring.

→ She is

6) As Nghi is kind, everybody likes her so much.

→ Because of

7) Ha Noi is the cultural center of the country. It is the capital city of Vietnam.

→ Ha Noi,

8) I don't buy that car because it's so expensive.

→ If

9) The house is very big. Have you seen it?

→ Have you seen

10) Because he behaved badly, he found himself in trouble.

→ Because of

11) The test is so difficult that we can't finish it on time.

→ If

12) Mary is excited about organizing a show to raise money for the poor.

→ Mary is looking

13) As the river is polluted, people can't swim in it.

→ Because of

14) They live in a very lovely house.

→ The house in which

15) Because I am late, I can't wait for you.

→ If

16) Mary is looking forward to meeting her parents again.

→ Mary is excited

17) We are going to meet our uncle. He will visit us at Christmas.

→ We

18) Despite her good performance, she lost the match last week.

→ Though she

19) This man can't go out today because he has no free time.

→ If

20) My sister's finding the job which has a good salary.

→ My sister's looking

21) Many people are fined because they don't follow traffic rules.

→ If

22) We expect a holiday abroad.

→ We are

23) Da Lat, a mountainous city, is called "City of Eternal Spring".

→ Da Lat, which

24) Because this shirt is old, I don't want to wear it any longer.

→ Because of