----Merry Christmas! ----__________
— You should ______ the customers tea before meals.—But they said they couldn’t wait to eat.
Bill doesn’t like the sunglasses because they can’t ______ the sun well.
The river smells terrible. People must_____ dirty things into it.
—Do you like doing sports , Joe?—Of course. We can’t keep healthy_____ taking enough exercise.
In China , people are supposed to ______ instead of_____.