In order not to be _________, I spoke in a man's voice on the phone.
A. realized B. recommended C. requested D. recognized
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
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
---- 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
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
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
