The bus dropped me off and pulled away _____I realized I had left my bag on it.
A. while B. before
C. after D. since
If it had not been for the heroes’ contributions and sacrifices, we _____such a happy life.
A. wouldn’t have led B. wouldn’t be leading
C. haven’t led D. are not leading
—Kevin, time for the next destination!
—No hurry! Another 15 minutes and we _____ all the exhibition rooms of the museum.
A. am exploring B. have explored
C. will explore D. will have explored
To make a breakthrough in his scientific research, the scientist has been making a(n) _____amount of effort.
A. modest B. miserable
C. optional D. tremendous
Since the match is over, we can ____by travelling and stop thinking about basketball.
A. dive in B. switch off
C. pull out D. split up
Taking targeted measures to help people lift themselves out of poverty, _____has been predicted, is fruitful.
A. what B. which
C. as D. that
