13．It is ______(danger)to play football in the street．

12．It is ______(possible)for us to go to the moon tomorrow．

11．We should give them ______(free)to do what they like best．

10．I will wait here ______(直到)the concert is over．

C．用所给词的适当形式填空。(5分)

9．Could you tell us your ______(经历)as a volunteer in that small village?

8．The children ______(跟随)their parents into the room 5 minutes ago．

7．The first time he went into the room he smelt a ______(奇怪的)smell．

6．--What should we do?

--- You make the ______(决定)

5．Don't be n______．You've got just a little cold．

B．根据所给的汉语意思完成英语句子。(5分)

4．You should speak English as much as p______ in class．