1. the computer is absolutely ______ amazing technological revolution. just imagine what ______ fun it is playing computer games over the weekend!
a. the; the b. an; 不填 c. 不填；a d. an; a
2. in the past few years, so many areas throughout the world have been hit by such destructive earthquakes, snowstorms and tsunamis ______ we have never experienced before, ______ makes us worried a lot about nature disasters.
a. that; that b. as; which c. which; it d. when; as
3. children need to feel ______ in order to do well at school.
a. secure b. fun c. popular d. threatened
4. the elderly ______ good care of in public places like supermarkets and airports; they are likely to get lost.
a. can have been taken b. ought to be taking
c. must be taken d. should take
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