I think I　　　　   it during the concert,  　　   it might still be in the symphony hall.

2.应该允许年轻人选择他们自己的服饰。

Teenagers should be　　    　　   choose their own clothes.

3.他们没做作业而是在聊天。

They talk　　    　　   doing homework.

4.你不必为别人穿什么而操心。

You shouldn’t　　    　　   what other people are wearing.

5.好像玉梅已经改变了许多。

It 　　    　　   Yu Mei has changed a lot.