The Canadian friends have given us a lot of books, few of _____ a bit difficult for us.
| A．them are | B．that is | C．which are | D．which is |
Mr. Bush is on time for everything. How _______ it be that he was late for the opening ceremony？
| A．can | B．should | C．may | D．must |
—I hear you've got a set of valuable Australian coins. ___I have a look？
—Yes, certainly.
| A．Do | B．May | C．Shall | D．Should |
—Is John coming by train？
—He should, but he ＿ not． He likes driving his car.
| A．must | B．can | C．need | D．may |
I told Sally how to get here, but perhaps I _________ for her.
| A．had to write it out | B．must have written it out |
| C．should have written it out | D．ought to write it out |
I was really anxious about you. You ＿home without a word.
| A．mustn't leave | B．shouldn't have left |
| C．couldn't have left | D．needn't leave |