--Who is the old man talking with your teacher? ---I don’t know. I him before.
Will you help him________ you see an old man in trouble ?
I usually do my homework after dinner until 10 pm, ______ is my bedtime.
We are told that more new teaching buildings ________ next year.
It is no use _______ about the coming exam. A. worry B worrying C worried D to worry
I don’t feel like ______ anything now, for I am so tired.