My uncle is ________ engineer. He works very hard.A. the B. a C. an
They had much difficulty ____________ the problem and they needed our help.
You’d better go to bed early. Don’t ____________ too late.
He is very modest and he never ____________.
World War Ⅱ____________ in Europe in 1939.
I don’t think it is a good idea. Can you____________ another one?