Nowadays, mobile phone is popular means of communication.
| A．the; a | B．a; 不填 | C．the; the | D．a; the |
When ____ about the source of his income, he hesitated for a moment, obviously not willing to give us a direct answer.
| A．asked | B．asking | C．being asked | D．having asked |
In the past few months, a discussion ________about whether selecting “Three Goods” Students in elementary and middle schools should be cancelled.
| A．has to be held | B．has been held |
| C．has been holding | D．was held |
—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 |
The expo is being held in Shanghai, _______a lot of advanced technology is shown for the first time.
| A．why | B．which | C．when | D．where |
That kind of plant can be made ______ paper and paper can be made ______ wood.
| A．of; of | B．from; of | C．from; into | D．into; from |