--- My bike is broken. May I go ______ yours?
---- Sorry, mine ________ broken down.
| A．on, is | B．by, is | C．on, has | D．by, has |
—Have you known Mr. Smith for a long time?
—Yes, since he ______ to our university.
| A．come | B．came | C．comes | D．has come |
I didn't manage to repair my car ______ you had told me how.
| A．until | B．when | C．unless | D．because |
More than 70,000,000 sharks ______ for their fins every year. It's really time for us to do something.
| A．kill | B．killed |
| C．are killed | D．were killed |
—Lily doesn't mind lending you her dictionary.
—She ______. I have already borrowed one.
| A．mustn't | B．needn't | C．shouldn't | D．can't |
Betty is a real book lover and often brings home many books to read ______ the school library.
| A．in | B．through | C．from | D．for |