A teacher's________to the cause of education is worth great respect of the whole society because it brings countless benefits to the development of society.
I regret ______ you that you have not been chosen for the performance.
—Waiter, ______ ? —Sure. Here’s your bill.
The number of the students ______ this year’s entrance exam is 650,000 less than last year.
. It ______ last night ______ Tom saw an interesting film in Dongfeng Cinema.
. Only when class began ______that he had left his book at home.