Wecan never expect bluer sky unless we create lesspolluted world

The fire was finally inJilin Province on June 3. Unfortunately, 119 people lost their lives.—I hope the accident like this won’t happen again.

I think students______ to do homework with friends.

________ our teacher is ill, ________ he still comes to our class to teach us.

Teenagers should do more and learn how to look after ___________.