I have no choice but _____and sleep.
I don’t think he is ______ to come to our help when we get into trouble.
Tom ________ in the library every night over the last three months.
Reading is ________ good habit. Stick to it, and you’ll make ________great progress.
-----May I ask a question after class, Sir?-----_______, but not during my lunch break.
We went through a period _______ communications were very difficult in the rural area.