用所给单词的适当形式填空。

1. Simon said he had a _______( please) journey last week.

2. Every year many _______( tour)  come to Beijing to visit the Great Wall.

3. We should work hard at English because it's important in our_______( day) life.

4. It is_______ (possible) for him to finish the work in one hour, because it's very difficult.

5. Don't worry! They can take care of_______( they).