It is necessary _____ something to protect our environment.
A. do B. to do C. does D. doing
If it ______ tomorrow, I’ll go hiking with my friends.
A. won’t rain B. will rain C. doesn’t rain D. rains
I often see her _______ the piano. Listen, can you hear her _________ the piano now?
A. play, playing B. plays, playing
C. playing, plays D. play, plays
--- I’m sorry I ____ my homework at home.
--- That’s all right. Don’t forget ____ it to school this afternoon.
A. forgot; bringing B. left; to bring
C. left; bringing D. forgot; to bring
The flowers ________ every day, or they will die.
A. must water B. can be watered
C. should water D.must be watered
--- Jack, you look tired today. What’s wrong?
--- I was ____ busy ____ I didn’t go to bed until midnight yesterday.
A. too; to B. so; that C. enough; to D. such; that
