He worked in a car factory for four years，______ he founded his own company in his hometown．

They were surprised that a child should work out the problem____ they themselves could not

Tom is a promising student. I am sure that withhis________effort, he will make a very successful scientist.

My daughter mastered Japanese in less than twoyears.—Did she Shehave a gift for language.

Mr. Smith, would you please speak a little more ________—Sorry! I thought you could follow me.