I know one of the things _____I was unsure about was _____ hard it would be to climb this mountain.
A. that; how B. what; how C. which; what D. /; what
Since the recent river pollution in several provinces, people _______ more and more attention to the quality and safety of drinking water.
A. pay B. are paying C. have paid D. have been paying
Finally he reached a lonely island ________ was completely cut off from the outside world.
A. when B. where C. which D. whom
China’s first aircraft carrier, ____ as long as 304 metres, was handed over to the People’s Liberation Army navy in 2012.
A. measures B. measured C. to measure D. measuring
It was difficult to tell exactly _______ the saying began, but it is possible that it was in the theatre or movie industry.
A. where B. when C. why D. that
—The company has been performing poorly during the past few years.
—In my view, it needs to _______ its image.
A. hold up B. take up C. step up D. polish up
