Exercise 1: Choose the correct answers.
1. He got wet he forgot his umbrella.
A. because of B. because C. but D. and
2. He stops working heavy raining.
A. in spite of B. although C. despite D. because of
3. They have a lot of difficulties in their life their poverty.
A. in spite of B. although C. because D. because of
4. Jill and Jolly were happy it was their both birthday party that day.
A. because B. even though C. spite of D. Despite
5. Nobody could hear her she spoke too quietly.
A. although B. because C. because of D. in spite of
6. We decided to leave early the party was boring.
A. although B. despite C. because D. because of
7. We all feel sad the bad news
A. because B. because of C. though D. despite
8. John lost his job his laziness.
A. because of B. because C. in spite of D. though
9. We can't go to Julia's party we're going away that weekend.
A. because B. because of C. although D. in spite of
10. Nam was absent from class yesterday he felt sick.
A. so B. because C. although D. but
Exercise 2: Choose the correct answers.
1. The boy can’t reach the shelf he’s not tall enough.
A. because B. although C. even though D. and
2. She couldn’t unlock it she had the wrong key.
A. while B. but C. though D. because
3. Nam failed the final exam he was lazy.
A. while B. though C. because D. but
4. We watched TV the whole evening we had nothing better to do.
A. because B. though C. so D. but
5. We didn’t go for a walk it was very cold.
A. though B. because C. but D. so
6. They decided not to go out for a meal they were too tired.
A. so B. because C. but D. if
7. I’m learning English I want to get a better job.
A. or B. because C. therefore D. but
8. Last night we came to the show late the traffic was terrible.
A. although B. despite C. and D. because
9. Lan couldn’t pass the exam she is too lazy.
A. because B. because of C. although D. in spite of

10. his broken leg, he didn’t come to class yesterday.
A. because B. because of C. despite D. so
Exercise 3: Complete the sentences with because/ because of.
1. We delayed our trip the bad weather.
2. Sue’s eyes were red she had been crying.
3. My mother is always complaining the untidiness of my room.
4. The water in most river is unsafe to drink it’s polluted.
5. The trees were bend over the wind.
6. You can’t enter this secure areas you don’t have an official permit.
7. It’s unsafe to travel in that country the ongoing civil war.
8. Several people in the crowd became ill and fainted the extreme heat.
9. Mark didn’t go to work yesterday he didn’t feel well.
10. We couldn’t get into the disco the enormous crowd.
Exercise 4: Complete the sentences with because/ because of.
1. I went home early I was feeling unwell.
2. We decided not to go out for a meal we were simply too tired.
3. I couldn’t get to sleep the noise.
4. He only accepted the job the salary, which was very high.
5. Sarah can’t climb up the tree her fear of heights.
6. his age, John was not hired he had the necessary qualifications.
7. Mary came to class late her motorbike had a puncture.
8. Sandy didn’t go to school yesterday she was sick.
9. She went to bed early her tiredness.
10. I couldn’t do the test it was too difficult.
Exercise 5: Rewrite the sentences, using because/because of
1. He didn’t come because of his sickness.
2. The train was late because the fog was thick.
3. The plane couldn’t take off because of the bad weather.
4. He left the school because his family was poor.
5. We couldn’t study because of the noise.
6. I didn’t go swimming because it was cold.
7. These students arrive late because of the bad traffic.
8. Mary can’t sleep because she has drunk a cup of strong coffee.
9. Because of getting up early, he wasn’t late for the first train.

Bài 1: Bài tập về các thì
1. I (learn) English for seven years now.
2. But last year I (not/ work) hard enough for English, that's why my marks (not/ be)
really that good then.
3. As I (pass/ want) my English exam successfully next year, I (study) harder this term.
4. During my last summer holidays, my parents (send) me on a language course to
London.
5. It (be) great and I (think) I (learn) a lot.
6. Before I (go) to London, I (not/ enjoy) learning English.
7. But while I (do) the language course, I (meet) lots of young people from all over the
world.
8. There I (notice) how important it (be) to speak foreign languages nowadays.
9. Now I (have) much more fun learning English than I (have) before the course.
10. At the moment I (revise) English grammar.
11. And I (begin/ already) to read the texts in my English textbooks again.
12. I (think) I (do) one unit every week.
13. My exam (be) on 15 May, so there (not/ be) any time to be lost.
14. If I (pass) my exams successfully, I (start) an apprenticeship in September.
15. And after my apprenticeship, maybe I (go) back to London to work there for a while.
16. As you (see/ can), I (become) a real London fan already.
Bài 2: Chọn đáp án đúng nhất
1. When I last saw him, he _____ in London.
A. has lived B. is living C. was living D. has been living
2. We _______ Dorothy since last Saturday.
A. don't see B. haven't seen C. didn't see D. hadn't seen
3. The train ______ half an hour ago.
A. has been leaving B. left C. has left D. had left
4. Jack ______ the door.
A. has just painted B. paint C. will have painted D. painting
5. My sister ________ for you since yesterday.
A. is looking B. was looking C. has been looking D. looked
6. I ______ Texas State University now.
A. am attending B. attend
C. was attending D. attended
7. He has been selling motorbikes ________.
A. ten years ago B. since ten years
C. for ten years ago D. for ten years
8. Christopher Columbus _______ American more than 500 years ago.
A. discovered B. has discovered
C. had discovered D. had been discovering
9. He fell down when he ______ towards the church.

A. run B. runs C. was running D. had run
10. We _______ there when our father died.
A. still lived B. lived still C. was still lived D. was still living
11. They ______ table tennis when their father comes back home.
A. will play B. will be playing C. play D. would play
12. By Christmas, I _______ for Mr. Smith for six years.
A. will have been working B. will work
C. have been working D. will be working
13. I _______ in the room right now.
A. am being B. was being
C. have been being D. am
14. I ______ to New York three times this year.
A. have been B. was C. were D. had been
15. I'll come and see you before I _______ for the States.
A. leave B. will leave C. have left D. shall leave
16. The little girl asked what _______ to her friend.
A. has happened B. happened
C. had happened D. would have been happened
17. John ______ a book when I saw him.
A. is reading B. read C. was reading D. reading
18. He said he _______ return later.
A. will B. would C. can D. would be
19. Jack ________ the door.
A. has just opened B. open
C. have opened D. opening
20. I have been waiting for you ______.
A. since early morning B. since 9 a. m
C. for two hours D. All are correct
21. Almost everyone _______ for home by the time we arrived.
A. leave B. left C. leaves D. had left
22. By the age of 25, he ______ two famous novels.
A. wrote B. writes C. has written D. had written
23. When her husband was in the army, Mary ______ to him twice a week.
A. was reading B. wrote C. was written D. had written
24. I couldn't cut the grass because the lawn mower ______ a few days previously.
A. broke down B. has been broken
C. had broken down D. breaks down
25. I have never played badminton before. This is the first time I _____ to play.
A. try B. tried C. have tried D. am trying
26. Since _______, I have heard nothing from him.
A. he had left B. he left C. he has left D. he was left
27. After I _______ lunch, I looked for my bag.
A. had B. had had C. have has D. have had

28. By the end of next year, George _______ English for two years.
A. will have learned B. will learn
C. has learned D. would learn
29. The man got out of the car, ________ round to the back and opened the book.
A. walking B. walked C. walks D. walk
30. Henry _______ into the restaurant when the writer was having dinner.
A. was going B. went C. has gone D. did go
31. He will take the dog out for a walk as soon as he ______ dinner.
A. finish B. finishes C. will finish D. finishing
32. I will be glad if he _______ with us.
A. had gone B. did go C. went D. goes
33. Ask her to come and see me when she _______ her work.
A. finish B. has finished C. finished D. finishing
34. Turn off the gas. Don't you see that the kettle ________?
A. boil B. boils C. is boiling D. boiled
35. Tom and Mary ______ for Vietnam tomorrow.
A. leave B. are leaving C. leaving D. are left
36. He always ________ for a walk in the evening.
A. go B. is going C. goes D. going
37. Her brother ______ in Canada at present.
A. working B. works C. is working D. work
38. I ______ to the same barber since last year.
A. am going B. have been going C. go D. had gone
39. Her father ______ when she was a small girl.
A. dies B. died C. has died D. had died
40. Last week, my professor promised that he ________ today.
A. would come B. will come C. comes D. coming

Phân biệt để thấy sự tiến hóa của thằn lằn bóng đuôi dài so với ếch đồng về:
- Bộ xương
- Hệ tuần hoàn
- Hệ hô hấp

Kể tên 4 công trình kiến trúc tiêu biểu thời Lý - Trần - Hồ ?Hãy lựa chọn 1 công trình kiến trúc và đóng vai 1 hướng dẫn viên du lịch để giới thiệu về công trình đó.

Điền từ vào chỗ chấm:

a) Một lực sĩ nâng và giữ tạ đứng yên. Lực ............ của lực sĩ và ............ của quả tạ là 2 lực cân bằng

b) Buộc 1 hòn sỏi nhỏ vào 1 sợi dây cao su. Dây cao su dãn ra,sau đó hòn sỏi đứng yên. Lực kéo của dây cao su và ............ của hòn sỏi là 2 lực ............

c) Vật nặng treo vào đầu lò xo đường ray một lực ............

d) Đoàn tàu tác dụng lên đường ray 1 lực ............

e) Lực sĩ tác dụng lên cái tạ 1 lực ............

f) Quả bóng bay lên cao nhờ lực ............ của ko khí

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Chỉ ra lực nào cân bằng vs trọng lực trong các trường hợp vật đứng yên sau:

a) Chiếc ghế nằm yên trên mặt đất

..............................................................

b) Bóng đèn treo trên đầu sợi dây

..............................................................

c) Chiếc tàu trên mặt nước

..............................................................

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Tính trọng lượng của các vật sau

a) Một quả trứng khối lượng 50g

..............................................................

b) Một con kiến khối lượng 1mg

..............................................................

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Chỉ rõ kết quả tác dụng của trọng lực lên các vật sau:

a) Em bé đứng trên ván gỗ

..............................................................

b) Vận đông viên nhảy từ trên cao xuống

..............................................................

c) Vật nặng trao trên một sợi dây cao su

..............................................................

d) Một mũi tên được bắn thẳng đứng lên cao

..............................................................

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