_______the sun is not yet up, many people are already taking exercise in Heping Square.
| A．Although | B．If | C．As | D．Because |
The room is ___________ for eight people to live in.
| A．big enough | B．enough big | C．so big | D．too big |
Though the player is over forty, he can run ___________ some younger players.
| A．much fast than | B．more faster than | C．so fast as | D．as fast as |
Don’t ___________ your dictionary all the time when you meet new words.
| A．work on | B．take on | C．depend on | D．keep on |
It is difficult __________ you ___________ finish the work in a week.
| A．of, to | B．with, to | C．with, for | D．for, to |
I can’t understand ____________ the boy alone.
| A．why did she leave | B．why had she left | C．why she left | D．why she had left |