—— ______ if I smoked? ——I'm sorry, but it's not allowed.
Columbus _________ the New World in 1492.
I’ll finish the job ____ I come across great difficulty.
My brother wants to work in the factory which _________ now.
He told me about thenews in avoice.
It is a paradox(自相矛盾) that ina rich country there should bemany poor people.