Something has to be done to stop the rivers from being further polluted, ?
| A．doesn’t it | B．hasn’t it | C．does it | D．has it |
The teacher demanded all the exercise books ______ the next day.
| A．to be handed in | B．would be handed in | C．be handed in | D．to hand in |
______ I could say a word, she had stormed out of the room.
| A．When | B．As | C．While | D．Before |
One of the best ways for people to keep fit is to ______ healthy eating habits.
| A．grow | B．develop | C．increase | D．raise |
I’m sorry to say you didn’t pass the exam-- ______, you won’t receive the diploma.
| A．on the whole | B．believe it or not | C．in other words | D．after all |
—John, why are you so tired?
—I ______ pingpong with Jimmy.
| A．play | B．played | C．have played | D．have been playing |