48d ,44c ,45a ,49c mới đúng chứ ?

Rewrite the following sentences as directed without changing their meaning: 

1.Someone will blow a whistle if there is an emergency.

a whistle………………………………………………..

2.I walked to school in twenty minutes .

It took …………………………………………………

3.Originally, tennis was an indoor game.

Tennis used  ………………………………………………

4.The restaurant is so dirty that no one wants to eat there.

It is such…………………………………………………

5.We ought to leave the party now if we are to catch the last train.

I-fwe-don’t  ……………………………………………………..

6.The dictionary is too expensive for Lan to buy .

Lan-wishes-the dictionary………………………………………………………

7.“Don’t leave here until we come back tomorrow morning”, the policemen said to the boy.

The police asked……………………………………………………………………….

8.The last time I saw Mary was at her sister’s wedding .

I haven’t……………………………………………………………………………..

9.We have never seen such an interesting movie like this before.

This is the …………………………………………………………………….

10.Mr. David drives his car more carefully than Mr.Brown.

Mr.Brown doesn’t                                                            …………………………………………………….

B nha bạn

cho 5,6 gam sắt tác dụng với dung dịch có chứa 7,3 gam HCl . tính khối lượng chất dư và thể tích H2 thoát ra ở đktc.