31. —How much do you know about the 3D film technology?
—A little. Not until ________ the hot movie Avatar ________ some about it.
| A．did I see; did I begin to learn | B．I saw; I began to learn |
| C．I saw; did I begin to learn | D．did I see; I began to learn |
All children are required to ______ school.
| A．attend | B．go | C．join | D．take part in |
Look at the trouble I am in! If only I your advice!
| A．followed | B．had followed | C．should follow | D．would follow |
The teacher demanded all the exercise books ______ the next day.
| A．to be handed in | B．would be handed in | C．be handed in | D．to hand in |
______ I could say a word, she had stormed out of the room.
| A．When | B．As | C．While | D．Before |
One of the best ways for people to keep fit is to ______ healthy eating habits.
| A．grow | B．develop | C．increase | D．raise |