We should protect the environment, for plenty of fresh air ________ to good health.
| A．adjust | B．contributes | C．distributes | D．appeals |
— I’ll tell Mary about her new job tomorrow.
— You ______ her last week.
| A．ought to tell | B．would have told | C．must tell | D．should have told |
“The interest ______ be divided into five parts, according to the adreement made by both sides,” declared the judge.
| A．may | B．should | C．must | D．shall |
You might just as well tell the manufacturer that male customers _____ not like the design of the furniture.
| A．must | B．shall | C．may | D．need |
How ______ you say that you really understand the whole story if you have covered only part of the article ?
| A．can | B．must | C．need | D．may |
— What's the matter with the man hanging his head there?
— Well, if you _____ know, he was caught stealing my bike.
| A．must | B．may | C．can | D．shall |