题目内容：

根据句子意思，用括号中所给单词的适当形式填空

1. May Day is coming, but I’m        (sure) where to go on holiday.

2. I had no difficulty       (make) myself understood on the chat show.

3. The police came and took the        (noise) men away from the cafe room.

4. All the       (visit) bags will be looked after by the guide during the game.

5. If you don’t know about this matter very well, you had better       (keep) quiet.