The owner still doesn’t know _______ broke into the house and stole the money.
A. when it was that B. who it was that C. who was it that D. when was it that
The scientists have made an exhaustive study of the virus _______ many people have been inflected.
A. to which B. in which C. with which D. for which
When I was in Spain last summer, I ______ quite a lot of Spanish.
A. made up B. picked up C. gave up D. took up
It comes as no surprise that many parents walk along their young children ____ their safety.
A. in search of B. in place of C. for fear of D. for lack of
Within a few years China ____ well have the most advanced railway industry in the world.
A. will B. can C. must D. may
It’s reported that global warming is heating the planet twice as quickly as _____ feared.
A. extremely B. previously C. preciously D. eventually
