---- Peter, can you tell me the differences _____ the four words?---- Sorry, I don’t know.
Don’t worry! I’ll do what I can you when you are in trouble.
—I have never been to African countries. What about you?— ________.
—Do you think if Tom the work well?—I think he will if he his best.
These books were really good, so she couldn’t .
—You did a good job. I’m proud of you.—________.