No smoking, please. It’s ____ the rules.
A. against B. for C, on D. at
Although we are young, ______ we can still do something to help them.
A. but B. / C. and D. however
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
