. Sophie dreams of walking in __________ outer space like __________ astronaut one day.
| A．/; the | B．/; an | C．an; an | D．a; an |
—How many practical plans has your deskmate made this week?
—. All have turned out disappointing.
| A．None | B．Nothing | C．Nobody | D．No |
Fortunately , the adventurers brought the GPS with themselves, they might have been lost in the desert.
| A．of which | B．without which | C．in which | D．about which |
— People should spare no efforts to protect the environment.
— ________. Air pollution does harm to our health.
| A．All right | B．Take it easy | C．Go ahead | D．Exactly |
Our responsibility is weightier than ______Mount Tai, and our road ahead is _______ long one．
| A．the；不填 | B．a；the | C．a；不填 | D．不填；a |
Never before______ such a wonderful park, ______ I'd like to pay a visit again.
| A．had I seen; where | B．have I seen; which |
| C．have I seen; where | D．had I seen; which |