He is sitting __________ the classroom.
_______ necessary for us _______ English well. A.It’s; to learnB.It’s; learn C.That’s; learn
—Watching TV too much _______ bad for your eyes. —I’ll go to bed right away. A.beB.are C.is
We must keep our classroom______. A. cleaning B. cleanC. to clean
—Would you mind _______ us in the game? —Not at all. A.joiningB.join in C.joining in
Don’t worry. We have _______ time to catch the train. A . a fewB.lot ofC.plenty of