Modern science has given clear evidence ________ smoking can lead to many diseases.(2011·天津，13)
| A．what | B．which | C．that | D．where |
.
We can’t use the bridge now, because it _______.
| A．has been repaired | B．is repairing | C．is repaired | D．is being repaired |
.
--- Shall we go shopping together this afternoon?
--- _______. I will be very busy then.
| A．Out of question | B．Out of the question | C．No problem | D．Good idea |
.
________ the absence of any further evidence the police were unable to solve the murder.
| A．For | B．From | C．On | D．In |
.
. The chair looks rather hard, but believe it or not, it is very comfortable _____.
| A．sitting | B．to sit | C．sitting on | D．to sit on |
.
It was _____ his mother came in _____ to prepare his lessons.
| A．not until; did the boy begin | B．until; that the boy didn’t begin |
| C．until; did the boy not begin | D．not until; that the boy began |