________the temperature falling so rapidly，we couldn't go on with the experiment.
| A．Since |
| B．For |
| C．As |
| D．With |
I usually take something to read when I travel by train _____I feel bored．
| A．as if | B．so that | C．in case | D．even though |
Out _____, with an apple in his hand．
| A．rushed the boy | B．did the boy rushed |
| C．the boy rushed | D．the boy did rush |
Not until he met with the difficulty _______ the importance of group work．
| A．he realized | B．did he realize | C．realized he | D．he didn’t realize |
The thief must have hidden somewhere in the _______ area．
| A．following | B．surrounding | C．surrounded | D．surroundings |
I do not want to accuse him _____ telling lies．
| A．of | B．against | C．with | D．about |