I can’t promise that all the people injured in the accident will be saved. All I can promise is that what _______ be done _______be done.
________ either of your parents come to see you recently?
Both rice and wheat _____ grown in our country.
Mathematics _______ the language of science.
Stories of the Long March _______ popular with the young people now.
Three million tons of coal ______ every year in the city.