.Never before______ so highly successful in his attempts to forecast the weather accurately on a small scale.
A.man has been | B.man is | C.has man been | D.will be man |
Although ____ my opinion, the old professor didn’t come up with his own.
A.against | B.on | C.for | D.in |
The field research will take Joan and Paul about five months;it will be a long time_____we meet them again.
A.after | B.before | C.since | D.when |
My parents live in a small village. They always keep candles in the house ___ there is a power cut.
A.if | B.unless | C.in case | D.so that |
It is difficult for us to learn a lesson in life _____we’ve actually had that lesson.
A.until | B.after | C.since | D.when |
____fire, all exits must be kept clear.
A.In place of | B.Instead of | C.In case of | D.In spite of |