—Is your brother in?—No.________ he comes back, I’ll tell you.
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_____.
— How does Jack usually go to school? — He _____ ride a bike, but now he ______ there to lose weight.
—Shall I take you home after school? — No, thanks. Father will_____ on his way home.