_____chapter in Oxford English often consists of four parts．—That’s right．And this chapter mainly talks about _____environmental problems．

The number of teachers in our school _______ greatly increased last term.A number of teachers in this school ______from the countryside.

What could I get my father for Father’s Day? — _____getting him a tie?

____ does he like pandas?—Because they are cute.

I wonder if youfor a picnic tomorrow. —If it,I will go.