It ______ be the postman at the door. It’s only six o’clock.
| A．mustn’t | B．can’t | C．won’t | D．needn’t |
As teenagers of the 21st century, we should be ready to _____ the challenge of society.
| A．put | B．do |
| C．make | D．meet |
The reason _____ they held a party was _____ it was Sue’s birthday.
| A．why; because | B．why; that |
| C．that; that | D．that; because |
--Why do you look pale today?
--I was very ________my mother’s illness. I stayed awake last night.
| A．concerned about | B．concerned with |
| C．concerned in | D．concerned to |
I _____ in the street when someone _____ me.
| A．walk; called | B．walking; calling |
| C．was walking; called | D．walked; called |
On AIDS Day, the minister of Health Department demanded that the problems ______ paid special attention to.
| A．referred to being | B．referred to be |
| C．refer to being | D．refer to be |