It was dark, but I could see a man on the floor, with a rope.
| A．lie, tie up | B．lay, tied up | C．lying, tied up | D．lying, tying up |
It is demanded that you ____ at six.
| A．will arrive | B．arrive | C．arrived | D．would arrive |
At present，there is little doubt ________ short message plays an increasingly important role in our lives．
| A．whether | B．if | C．that | D．which |
— Are you a teacher?
— No, but I ______. I worked in a middle school for three years.
| A．am | B．will | C．do | D．was |
— Is your mother going to the supermarket？
— No，______.
| A．she doesn’t | B．she’s cooking | C．she gets by bus | D．to a tailor’s shop |
______，I will help you with your work.
| A．If I am possible | B．If it possible | C．If possible | D．Possible |