The time he has devoted in the past years __________ the disabled is now consideredto be __________ great value __________ him.
—Are you worried about the coming exam?—No, I think the more ________ you study, ________ mistakes you’ll make.
— ________ have you learned to play the piano?— ________ five years ago.
—I'm going to visit Yellow Mountain with my family this weekend.— ________.
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?— ________.