Everyone on this planet is different, and that's______ makes it such a beautiful place.
A.When B.how C.what D.why
I was taught to sit quietly in class and not to speak______ someone asked me a question.
A.When B.unless C.because D.if
Success only______ those with courage and determination.
A.favors B.requests C.reflects D.instructs
This novel mainly deals with the pride of man______ is basically the cause of many failures.
A.why B.who C.what D.which
It turned out that the hotel was so near. I ______ the taxi.
A.needn't have taken B.must have taken C.should take D.could take
The researchers say they will ______ more studies to confirm the results.
A.give away B.make out C.carry out D.put up
