Our government ______ all people to save energy and fight against pollution.

Mr.Green, __________ you _________the Great Wall last Sunday?— No, but I’ll visit it next week.

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

. A: Whose shirt is this? Is it Tom’s? B: No, it isn’t. ______________ is white.

My friend _______Tibet next Sunday.