It is getting warmer and warmer. You ________ wear so many clothes.
---You have to work very hard in your job, don’t you? ----Yes, but I don’t mind that. I _____ hard.
--- I don’t know ______ my telephone number. --- Through a friend of mine.
---David,is that man your Chinese teacher? ---It___________ be him.He’s having a meeting.
---Why weren’t you at the meeting? ---I ____for a long distance call from my sister in America.
--- Perhaps we can go to the home for the elderly to do some voluntary work. ----______ We should give the elderly a warm hand as often as possible.