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      caused the accident is still a complete mystery.

Nobody wants to___________ especially in public.

_______ it rain tomorrow, we would stay at home.

 Although this medicine can cure you     your illness, it has a bad effect____you.

 Unless ___ to speak, you should remain silent at the conference.

 Not until I began to work ______ how much time I had wasted.　

She thought I was praising her son, _____ as a matter of fact, I was scolding him for his bad behavior at school.

Mr Smith, _____ of the _____ speech, started to read a novel. 

There is no need ______ because Mr. Smith is still sleeping.

 Long ago, man used to ______ with his hands but now man is used to ______ with machines, and sometimes a robot is used to ___ instead of people.