A man landed on Mars? You must be joking. It ______ be true.
| A． mustn’t | B．can’t | C． needn’t | D．won’t |
26．I called Nancy many times but couldn't get through．Someone ______ on the phone all the time!
| A．has been talking | B．was talking |
| C．has talked | D．Talked |
25．How convenient the public transportation is! There ______ be any difficulty traveling around．
| A．mustn't | B．wouldn't | C．shouldn't | D．needn't |
24．—I just heard you had an adventure in the desert．
—We lost our way and ______ made matters worse was that our jeep broke down．
| A．how | B．that | C．it | D．What |
23．______ is reported, a new town has been built on the ruins left by the big earthquake．
| A．It | B．As | C．Which | D．This |
22．His suggestion is that ______ action be taken to improve ______ situation．
| A．/; the | B．an; the | C．I; a． | D．the;a |