4. People of all (年齡) should know the importance of traffic safety.

2. (物理) is one of her favourite subjects.

3. Jack often does some (實(shí)驗(yàn)) in the lab.

1. Our teacher (懲罰) students who didn't hand in their homework.

4. 如果我飯后開(kāi)始的話(huà)，我在上床睡覺(jué)之前就可以完成它。

I start after dinner, it before I go to bed.

5. 真遺憾！

 !

3. 例如，如果你想用沙子填滿(mǎn)一個(gè)袋子……

, if you want to a bag sand. . .

1. 請(qǐng)不要喧嘩！

No,please!

2. 不要穿過(guò)那條繩子！

that rope!

14. 至少；起碼 at 

15. 零花錢(qián)money

9. 代替；而不是 of 

10. 拜訪(fǎng)(某人的家) round 

7. 與某人達(dá)成協(xié)議    with sb.

8. 養(yǎng)成……的習(xí)慣   the habit of...

5. 學(xué)到；了解 learn...

6. 比較 與 compare… …