The old king decided to retire and the heavy load of responsibility to his three daughters.
| A．give out | B．hand over | C．take over | D．block out |
The biggest problem for most plants, which ______ just get up and run away when threatened, is that animals like to eat them.
| A．shan’t | B．can’t | C．needn’t | D．mustn’t |
— Is John coming by train?— He should, but he ______ not. He likes driving his car.
| A．must | B．can | C．need | D．may |
You _____ phone him if you want to, but you _____! He will surely phone you.
| A．may; mustn’t | B．have to; needn’t | C．can; needn’t | D．can; doesn’t need |
My aunt _____ here by now, for she took the early bus.
| A．must arrive | B．can arrive | C．may arrive | D．ought to have arrived |
The pilot kept calm in the terrible storm, otherwise the accident ______.
| A．couldn’t be prevented |
B．mustn’t have prevented |
C．wouldn’t have been prevented |
D．shouldn’t prevent |