The cost of sales makes up a large part of the prices that _____.
—What about __________ lecture yesterday?—Well,__________ most boring one indeed.
I think the biggest problem in banning smoking is ______ people can buy cigarettes easily.
— Have you told your parents about your decision? — Not yet. I can hardly imagine ______ they will react.
—Did you sleep well last night? — No, the loud noise from the street ______ me awake for hours.
The App WeChat provides a networking platform ______ communication is faster and easier.