In today’s fast changing and competitive world, to be able to learn faster and more effectively is not merely desirable; it is ________.
A. essentialB. worthwhileC. challengingD. sufficient
—What a pity! Their experiment is a failure.
—They ________ better under more favorable conditions.
A. should have doneB. could have done C. must have doneD. may have done
—Life is hard these days.
—At least we have some money left. That's ________, isn't it?
A. everythingB. nothingC. somethingD. anything
Having a glass of water first thing in the morning helps rid your body of poisonous substances that ________ overnight.
A. were stored B. had been stored
C. are being stored D. have been stored
Square dancing ________ to help maintain fitness has caused conflicts between the Damas and the neighboring residents.
A. claimingB. claimedC. having claimedD. to claim
Obviously the only way to make people realize that an action is morally wrong is to punish them if they ________ it.
A. confirm B. create C. commit D. compensate
