The teacher has a(an) ___________ to get off topic; sometimes it is difficult for students to make out what he is saying.
I’ll finish the job ____ I come across great difficulty.
My brother wants to work in the factory which _________ now.
He told me about the news in a voice.
It is a paradox(自相矛盾) that in a rich country there should be many poor people.
We are living in an age many things are done on computer.