Câu 18: Vật sáng N đặt trước gương phẳng cho ảnh N’ trong gương. Mắt ta nhìn thấy ảnh N’ trong gương khi:

1 điểm

A. tia sáng từ vật N truyền đến mắt

B. khi tia sáng truyền từ mắt đến N

C. khi tia phản xạ từ gương truyền đến mắt

D. khi tia phản xạ truyền đến mắt có đường kéo dài qua ảnh N’

Câu 14: Trong trường hợp nào sau đây, tia phản xạ và tia tới trùng nhau?

1 điểm

A. Tia tới vuông góc với mặt phẳng gương.

B. Góc tới bằng 0 độ.

C. Góc tới bằng 90 độ.

D. Câu A, B đúng.

I. Find the word which has a different sound in the part underlined.

1. A. volunteer B. engineer C. committee D. clear

2. A. population B. volunteer C. offer D. provide

3. A. tutor B. volunteer C. computer D. community

4. A. certain B. compare C. encourage D. community

5. A. charity B. chemistry C. chemical D. mechanic

9. When did you start your hobby?

- How long

10. Why don’t we go swimming this afternoon?

- What about

11. How about going to the movies tonight?

- Let’s

12. The last time I saw my uncle was two years ago.

- I haven’t

13. My father likes to do gardening at the weekend.

- My father enjoys

14. Lan didn’t go to school because she was sick.

- Lan was sick

15. This is the first time I’ve eaten this kind of food.

- I haven’t 16. If the homework is difficult, I will ask you for help.

- Unless

II. Choose the correct sentence that has the same meaning as the first:

1. I have never seen such a beautiful girl before.

- She is

2. This is the first time I have seen him.

- I haven’t

3. When did you have it?

- How long

4. They can avoid some diseases by eating a lot of fish.

- Eating

5. I haven’t eaten this kind of food before.

- This is the first time

6. My father and I share the same hobby.

- My father

7. I don't have enough meat.

- I don’t need

8. I wanted to eat sushi for dinner. I went to a Japanese restaurant.

- I wanted