1. The policeman warned the drive ________ so carelessly.
A. never to drive B. to never drive C. to not drive D. doesn’t drive
2. I will visit you if Father ______ me.
A. let B. lets C. is letting D. will let
3. The sun heats the earth, ___________ is very important to living things.
A. that B. what C. which D. where
