I want to be a doctor when I _______.
| A．grow up | B．talk about | C．get up | D．was born |
— Which sport will you take part in? — The ______ race.
| A．woman’s 800-meter | B．women’s 800-meter |
| C．woman’s 800-meters | D．women’s 800-meters |
—Humans can’t live _______ air.
—I agree with you.
| A．without | B．with | C．in | D．for |
He____know the answer, but I’m not sure.
A. maybe B. may be C:may D. must
—_______ can I keep the books? —Two weeks.
| A．How long | B．How often | C．How far | D．How soon |