What __________ useful book! And __________book is very interesting.
They're in different ________.A. class B. school C. schools
We shouldn't make noise here. It means “________”.A. Keep off the grassB. Keep quietC. Don't touch
The sign means you shouldn't ______ photoshere.A. take B. talk C. taking
Ben,open the window please. ______ close it.A. Don't B. Aren't C. Not
It's time ________ some cakes.A. to B. for C. for have