--- 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 |
— I have got a headache.
— No wonder. You___________in front of that computer too long.
| A．work | B．are working | C．have been working | D．worked |
The expert insisted that silkworms were first raised by a woman in___________is now Hebei Province.
| A．which | B．that | C．where | D．what |
My grandfather is as ___________as a young man and hates sitting around doing nothing all day.
| A．enthusiastic | B．energetic | C．talkative | D．sensitive |
— I am afraid the task is too difficult for me, sir.
—___________, Linda. Just believe in yourself!
| A．No problem | B．That's all right | C．That's OK | D．Come on |
— John, where are the cookies? Don't tell me you ate them all.
—___________. I couldn't help it. They were so good.
| A．Yes, I did | B．No, I didn't | C．Yes, I have | D．Why? Sound strange |