1. 补充句子。

1.人们不应该砍伐大量树木。

People shouldn't    lots of  trees.

2.这是好运的象征。

This is a symbol of   .

3.我认为我的计划能够实现。

 I think my plan can   .

4.他们正在练习拉小提琴。

They are    the violin.

5.她每天花多长时间做运动？

  does it take her to exercise every day?