下列各句中均有一处错误,请找出来并改正。

1. Several days ago, the thief noticed by the police.                       _________

2. How many people was invited to Mrs Brown's birthday party?      _________

3. When did the special programme set up to help young sportsmen?          _________

4. According to you, did your school football team be defeated this time?       _________

5. Now that Jane dances so well, I think she is chosen for the next competition.  _________

合成材料的应用与发展，大大方便了人类的生活，但由于合成材料废弃物的急剧增加带来了环境问题，废弃塑料带来的“白色污染”尤为严重．请你就怎样解决“白色污染”提出至少三条切实可行的措施．

（1）______（2）______；（3）______；（4）______．