Don’t be late class. We must be on time.
A．for B．to C．in
I ________ use a clock to wake me up because at six o’clock each morning the train comes by my house.
| A．couldn’t | B．mustn’t | C．shouldn’t | D．needn’t |
So I rudely replied, “You’ve dialed the wrong number! ” and then ________.
| A．hanged up | B．hung up | C．held on | D．held up |
His English ________ a lot since he took the course.
| A．improved | B．was improved | C．has improved | D．has been improved |
We will give you a good price ________ you are thinking of buying it.
| A．until | B．and | C．so that | D．if |
I become ________ in American history.
| A．more interested and more interested | B．more and more interested |
| C．more interesting and more interesting | D．more and more interesting |