30. The pilot, whether ______ or design, made the plane do a sharp turn.
Our English teacher suggested we ________ English as much as possible in class.
Remember to introduce your friend Stone to me when he arrives, ______?
______ young man standing there looks strong and healthy; however, as _________ matter of fact ,he has a serious disease.
I don’t agree with at all________ you said.
We were deeply impressed by the schools and teachers________ we had visited there.