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It is reported that 70% of people in China are ________ about the food security situation after  so many accidents.

   A. curious           B. concerned         C. cautious           D. certain

Scientists say it may be one year or so ________ it is possible to test the new medicine on human patients.

   A. when              B. after                C. before          D. since

---- An ant has two stomachs --- one for itself and the other for others.

  ----Really? Quite interesting. I ________ anything about it.

  A. don’t know        B. hadn't known         C. haven’t known    D. didn’t know

Stephen Hawking believes that the earth is unlikely to be the only planet     _life has developed gradually.        

A. that                 B. where                C. which                D. whose

Ladies and gentlemen, please fasten your seat belts. The plane _________.

  A. is taking off         B. takes off       C. has taken off       D. will be taken off

In order not to be _________, I spoke in a man's voice on the phone.

   A. realized           B. recommended         C. requested        D. recognized

The coastal city is ______ in natural resources, especially sea foods and water resources. 

   A. attractive          B. abundant             C. active           D. rare

The new trend of living a low carbon life is gradually changing people's idea on ______is cool and in fashion.

   A. which            B. that                C. what              D. whose

Do we spend money on unnecessary things so ______ is left for important things such as healthcare or education?

   A. nothing            B. none              C. no one            D. neither

----You look tired, Jack.

   ----I feel quite rested, _______.

   A. actually             B. especially         C. finally           D. gradually