You may use the room as you like ________ you clean it up afterwards.
| A．as far as | B．so long as | C．in case | D．even if |
25．—Can you tell me the timetable of the school bus?
—Well，the bus________here for the first trip at 6：30am．
| A．will leave | B．left | C．is leaving | D．Leaves |
24．The policemen_______the stolen place again and again，and finally they found the evidence who stole the antique（古董）．
| A．got through | B．picked up | C．went over | D．turned over |
23．What the boss really doubts is__________his employees will go on working in the company．
| A．that | B．weather | C．when | D．whether |
32. His composition won first prize, ______ made him too happy to sleep for nights.
| A．what | B．that | C．which | D．Where |
31. We are waiting ______ for your absence.
| A．your explanation | B．to have your explanation |
| C．about your explanation | D．having your explanation |