They are good friends. _______ is no wonder that they know each other so well.
| A．This | B．That |
| C．There | D．It |
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 |
impresses me most isChinese students are well organized and disciplined. We should learn from them.
| A．Which; what | B．What; that | C．What; whether | D．That; what |