—Could you join us this afternoon?
—Sorry, I _______. I take care of my little sister because my mother is out.
A.can’t; may B.couldn’t; have to C.can’t; have to D.couldn’t; may
There are many students _________ their homework in the classroom now because there is a lot of homework __________ today.
A.doing, doing B.to do, to do
C.doing, to do D.to do, doing
—I'm sorry I ______ my homework at home.
—That's all right. Don't forget ______ it to school this afternoon.
A.forget; to take B.forget; to bring
C.left; to take D.left; to bring
—Aren’t the animals in the zoo very friendly?
—________. They make beautiful sounds when they see visitors.
A.Yes, they are B.Yes, they aren’t C.No, they are D.No, they aren’t
We should________little children________water or fire.
A.ask; to play with B.ask; be careful with
C.tell; to be careful for D.tell; not to play with
— did you get to the bus stop, Millie?
— Oh, about 5 minutes ago. I think I need to wait for minutes.
A.How long; five more B.When; another five
C.How long; more five D.When; five another