______ you work hard, you’ll succeed some day.
| A．As long as | B．As soon as | C．As far as | D．As well as |
— What's the matter with Peter?
— He was seen crying when he was coming out of the teacher’s office. He ____ by the teacher.
| A．may be scolded | B．should have been scolded |
| C．must be scolded | D．must have been scolded |
They must have been enjoying themselves there, otherwise they _______ so long.
| A．can’t have stayed | B．wouldn’t have stayed |
| C．needn’t have stayed | D．couldn’t stay |
If I ever decided to quit, then nothing my parents or my coaches_____ say_____ change my mind. It's my life, not theirs.
| A．could; would | B．could; should |
| C．would; must | D．would; should |
His failure in the experiment suggested that he _______ his teacher’s proper instructions.
| A．should not have followed | B．should not follow |
| C．mustn’t have followed | D．hadn’t followed |
— The woman biologist stayed in Africa studying wild animals for 13 years before she returned.
— Oh, dear ! She ______ a lot of difficulties !
| A．may go through | B．might go through |
| C．ought to have gone through | D．must have gone through |