—Professor Smith, I’d like to take a gap year to Africa to serve in a global anti-Aids campaign.
—Good idea, ______ you can afford the time.
A. provided that B. in case
C. even if D. so that
Meeting again by chance, Lucy and Amy are delighted to _______ the friendship where it left out years ago.
A. set up B. build up
C. bring up D. pick up
David will succeed along the career ladder one day, I firmly believe, _______ he devote more energy to it.
A. might B. would C. could D. should
With China’s Singles’ Day approaching, shop owners offer large discounts ______ high sales volumes created by enthusiastic buyers.
A. in expectation of B. in regard to
C. in terms of D. in response to
Common sense requires us to get away from the concept that national boundaries are frontiers _________ knowledge may not spread.
A. with which B. across with
C. through which D. from which
—Could you say something about Turkey’s downing of the Russian fighter jet?
—Sorry. It ______ by a group of experts and will be made clear the moment they get the answer.
A. has been investigated B. is being investigated
C. was investigated D. was being investigated
