________ at the door before you enter my room, please.
| A．Knock | B．Knocking | C．Knocked | D．To knock |
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cooking，_______I.Unfortunately，the careless accident_______him his life.
| A．cost | B．spent | C．took | D．costed |
—Where can I find Martin?Dad is asking for him.
—He_______in the backyard chopping wood.
| A．supposes to stay | B．is supposed to stay |
| C．supposes staying | D．is supposed staying |
All agree that the pollution now is not easy_______.
| A．to be dealt with | B．dealing with |
| C．to deal with | D．to be dealing with |
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