题目内容：

 

1.Chairman Xi asks each of us Party members to _________________________________ (对自己严格要求).

2.Dean was so busy that he ________________________ (不得不拒绝) the invitation for dinner with Jill politely.

3.Nobody found he was a born artist ________________________________ (直到他获得了奖).

4.I noticed the 8-year-old boy __________________________ (毫不费力，没有困难) expressing himself.

5.He often doubts ___________________________ (是否值得) spending so much time doing his homework.