1. (2016·温州) 用方框中所给的单词的适当形式填空。每空限填一词.

You        sudden        discuss         whether         thousand

1. （1） Kate, be careful with the knife or you may hurt .

3. （2） The manager asked  he could find the cause of the accident

5. （3） It is reported that there are over thirty- five  works of art in Louvre Museum.

7. （4） When the children were climbing the mountains, a snake  appeared and scared them.

9. （5） Jack is interested in environmental protection and he often  the pollution problems with his friends.