I don’t know .
| A．what the population of Tianjin is |
| B．what is the population of Tianjin |
| C．how much the population in Tianjin is |
| D．how much is the population in Tianjin |
---You have to work very hard in your job, don’t you?
----Yes, but I don’t mind that. I _____ hard.
| A．used to work | B．am used to work |
| C．am used work | D．am used to working |
--- I don’t know ______ my telephone number.
--- Through a friend of mine.
| A．what did you get to know | B．what you got to know |
| C．how did you get to know | D．how you got to know |
---David，is that man your Chinese teacher?
---It___________ be him．He’s having a meeting．
| A．mustn’t | B．can’t |
| C．needn’t | D．won’t |
---Why weren’t you at the meeting?
---I ____for a long distance call from my sister in America.
| A．was waited | B．was waiting |
| C．has waited | D．have been waiting |
--- 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.
| A．I can’t agree more. | B．Do you think so? |
| C．Are you serious? | D．You must be joking! |