I.                  Read the text and answer the following questions:

KEEPING OUR TEETH HEALTHY

It’s very important to have healthy teeth. Good teeth help us chew our food. They also help us look nice. How does a tooth go bad? The decay begins in a little crack in the enamel covering of the tooth. This happens after germs and bit of food have collected there. Then the decay slowly spreads inside to the tooth. Eventually, poison goes into the blood, and we may feel quite ill.

How can we keep our teeth healthy? First, we ought to visit the dentist twice a year instead of only doing so when we feel the pain in our teeth. He can fill the small holes in our teeth before they destroy the teeth. He can examine our teeth to check that they are growing in the right way.

Secondly, we should brush our teeth with a toothbrush and fluoride toothpaste at least twice a day-once after the breakfast and once before we go to bed. We can also use wooden toothpicks to clean between our teeth after a meal.

Thirdly, we should eat food that is good for our teeth and our body: milk, cheese, fish, brown bread, potatoes, red rice, raw vegetables, and fresh fruits. Chocolates, sweets, biscuits and cakes are bad, especially when we eat them between meals. They are harmful because they stick to our teeth and cause decay.

1.      Good teeth help us.............................. our food.

A.    be nice                                                        B. have good eyesight

C. chew                                                           D. be important

2.      When food and germs collect in a small crack, our teeth ………………….

A.    become hard                                               B. send poison into the blood

C. begin to decay                                            D. make us feel quite ill

3.      A lot of people visit the dentist only when ………………….

A.    their teeth grow properly                           B. they have holes in their teeth

C. they have toothache                                   C. they have brushed their teeth

4.      We ought to clean our teeth ………………….

A.    after breakfast                                            B. before breakfast

C. before bedtime                                           D. both B &C

5.      We shouldn’t eat a lot of ………………….

A.    red rice                   B. fresh fruit               C. fish                         D. chocolate

Điền cụm từ thích hợp vào chỗ trống để hoàn thiện nghĩa câu sau:Ở san hô, khi sinh sản …(1)… thì cơ thể con không tách rời mà dính với cơ thể mẹ tạo nên …(2)… san hô có …(3)… thông với nhau. 

Đặc điểm của ruột thủy tức:

A. Dạng ống chưa phân nhánh

B. Dạng ống phân nhánh

C. Hình túi

D. Chưa có ruột (tiêu hóa nội bào

Chi tiết " Chiếc hôn của mẹ sẽ xóa đi vết vong ơn bội nghĩa trên trán con" có ý nghĩa như thế nào?

Exercise 1: Put the verbs in bracket into the past simple or the present perfect

1. I _have not played__ (not/play) tennis since I was at school but I __ (be) very good at it back then.

2. A: ______ you ________ (choose) a dress for the party yet?

B: Yes, I ______ (buy) one yesterday.

3. I think our teacher ______ (forget) about the test! He ___________ (not/ say) anything about it in the last season!

4. A: ____________ (you/ sell)  your house yet?

B: Yes, some people _______ (see) it last month and ________ (buy) it.

5. They __________ (lose) their cat. It ___________ (run) away last week.

6. 1) The police....................two people early this morning. (arrest)

7. 2) She............... Japan but now she...............back. (go - come)

8. 3) Dan..................two tablets this year. (already/ buy)

9. 4) How many games.................so far this season? (your team/ win)

10. 5)................the CN Tower when you................in Toronto? (you/ visit - stay)

11. 6)....................your homework yet? – Yes, I.................it an hour ago. (you/ do - finish)

12. 7) There...................an accident in High Street, so we have to use King Street to get to your school. (to be)

13. 8) I...............Peter since I...............last Tuesday. (not/ see - arrive)

14. 9) Frank..................his bike last May. So he...................it for 4 months. (get - have)

15. 10) I'm sorry, I..................earlier, but I..................a lot lately. (not/ write - work)

16. 1) Peter............... football yesterday (play)

17. 2) They................. the car. It looks new again. (clean)

18. 3) Last year we.................. to Italy. (be)

19. 4) John and Peggy...................... the book. Now they can watch the film. (read)

20. 5) I................. my friend two days ago. (meet)

21. 6) We never…………….... another country before. (visit)

22. 7) She......................... a new car in 2011. (buy)

23. 8) I'm sorry, but I........................... my homework. (forget)

24. 9)............you.................. the game of chess? (win)

25. 10) The girls........................ their lunch yet. (eat)