mọi người giúp mình bài tập này vớiiii

1..........................................cloning would become more popular in the next century.

2..........................................every home would have at least one robot to perform any boring task.

3..........................................parent didn't alow children to played computer games for along period of time.

4..........................................nutriton pills could cause serious side effects.

5..........................................nunclear power plants didn't require a lot of space.

6...........................................wrong decsions in chernobyl had caused a big nuclear explosion.