____ we want to know is whether we must finish the work ____ you assigned last week.
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.
There is no need ______ because Mr. Smith is still sleeping.
Mr Smith, _____ of the _____ speech, started to read a novel.
She thought I was praising her son, _____ as a matter of fact, I was scolding him for his bad behavior at school.
The wreckage of something like a jet plain discovered in the heart of the desert is believed ______ a UFO and _______down for reasons still mysterious.