I ________ use a clock to wake me up because at six o’clock each morning the train comes by my house. (2012·新课标全国，30)
| A．couldn’t | B．mustn’t |
| C．shouldn’t | D．needn’t |
It is usually warm in my hometown in April, but it ________ be rather cold sometimes.
| A．can | B．must | C．would | D．should |
You should be ________ a diet; otherwise you will get fatter and fatter.
| A．at | B．in | C．on | D．with |
The student _____ from the training so much that he was _____ the first prize in the game.
| A．benefited; awarded | B．awarded; benefited |
| C．gained; earned | D．earned; gained |
Some students even have no idea of they are studying, so they waste much time playing.
| A．what | B．when | C．why | D．where |
If you ________ smoke in the room, please keep the windows open.
| A．should | B．may | C．shall | D．must |