It usually ________ Mum about half an hour to cook supper．
| A．pays |
| B．takes |
| C．spends |
| D．costs |
We must keep the classroom ___________.
| A．clean | B．to clean | C．cleaning | D．cleaned |
----- Can you ride a horse?
--------No, I ________.
| A．needn’t | B．may not | C．can’t | D．mustn’t |
Trees __________every year to make our city greener.
| A．plant | B．are planted | C．were planted | D．will be planted |
-----Do you know the man ________ is reading the book over there?
--------- Yes, he is Mr. Green, our P.E. teacher.
| A．which | B．what | C．whom | D．who |
--------I often have hamburgers for my breakfast.
--------You’d better not. It’s bad for you _________ too much junk food.
| A．eat | B．to eat | C．eating | D．ate |