题目内容：

We think it’s probably a good idea for parents to allow teenagers ____in groups during the evenings. I know we get ____sometimes, but we learn a lot from each other. We also think that vacations should be ____.At present they’re too short. Longer vacations would give us time to do things like volunteering. ___summer I had an opportunity ___at the local hospital, but I couldn’t because I had to go back to school.

1.A .to watch      B.to study         C.study          D.play

2.A. noisy        B.quiet           C.crowded       D.lonely

3.A. short         B.quicker         C.longer         D.slower.

4.A. Last          B.Next           C.Before         D.In

5.A. volunteering   B.to volunteer     C. volunteering    D. volunteered