__________ has already been pointed out, grammar is not a set of dead rules.
| A．As | B．It | C．That | D．Which |
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 |
You can’t imagine that a well –behaved gentleman ______ be so rude to a lady.
| A．might | B．need | C．should | D．would |
— Write to me when you get home.
— __________.
| A．I must | B．I should | C．I will | D．I can |
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 |
No bread eaten by man is so sweet as ________ earned by his own labor.
| A．one | B．that | C．such | D．what |