If you _____ smoke, please go outside.

Couldyoutellme?—Hishomeisquitefarawayfromtheoffice,Ithink.

What would you do if you ________ on the moon?

He has two pets. One is a dog, ______ is a cat.

It’s difficult for the village children to cross the river for school.— I think a bridge _______ over the river.