— Must I take the medicine every day? — No, you ____.
A. must not B. may not C. don’t have to
We should take ____ active part in the battle to stop the germs.
A.the B.an C. /
_______ necessary for us _______ English well.
A.It’s; to learn B.It’s; learn C.That’s; learn
—Watching TV too much _______ bad for your eyes.
—I’ll go to bed right away.
A.be B.are C.is
We must keep our classroom______.
A. cleaning B. clean C. to clean
—Would you mind _______ us in the game?
—Not at all.
A.joining B.join in C.joining in
