—How long do you think it will be______ man can finally solve the problem of cancer?—Well,it depends
. We can’t use the bridge now, because it _______.
. --- Shall we go shopping together this afternoon? --- _______. I will be very busy then.
. ________ the absence of any further evidence the police were unable to solve the murder.
. . The chair looks rather hard, but believe it or not, it is very comfortable _____.
. It was _____ his mother came in _____ to prepare his lessons.