31. Hurry up! By the time we get to the church, the marriage service _____.
| A．had started | B．will have started | C．has started | D．must have started |
The poor boy the test again; in that case, his mother will be very disappointed.
| A．must have failed | B．might fail | C．could have failed | D．should fail |
It snowed heavily for three days and they were separated from the outside world.
| A．in the end | B．on end | C．by the end | D．at the end |
It’s said that there are plenty of hotels in that town. There be any difficulty for you to find somewhere to stay.
| A．wouldn’t | B．mustn’t | C．shouldn’t | D．needn’t |
If it was not an accident, he must have done it .
| A．on purpose | B．in common | C．on occasion | D．in time |
I have written to him because he phoned me shortly afterwards.
| A．ought to | B．must | C．couldn’t | D．needn’t |