第一节 单项填空(共15小题；每小题1分，满分15分)
请认真阅读下面各题，从题中所给的A、B、C、D四个选项中，选出最佳选项。
21．What we used to think________impossible now does seem possible.
A．is B．was
C．has been D．will be
22．Peter promised to attend our party，but he has not________.
A．showed off B．turned out
C．showed up D．come up
23．The injured mountain climber gathered all his________to climb up the high rock，where he might be seen by someone passing by.
A．strength B．power C．energy D．force
24．Alice is said________a new computer programmer recently，but I wonder whether she will get through her task this week.
A．to design
B．to have been designed
C．to have been designing
D．to have designed
25．The police wanted to know whether there was someone who________the robbery.
A．witnessed B．stared
C．looked D．proved
26．________，mother will wait for him to have dinner together.
A．However late is he
B．However he is late
C．However is he late
D．However late he is
27．He must have________the funny story.I can’t believe that it’s true.
A．picked up B．turned up
C．done up D．made up
