---Will it be a long time _______ I come for the pictures?
----No. It _______ be ready by 3:00．
| A．that; can | B．since; will | C．before; should | D．until; must |
Although he _______ the danger to his own health, he found it difficult to quit smoking.
| A．was very aware of | B．well awared of | C．was well aware of | D．very awared of |
We should _______ whatever is true.
| A．keep up | B．settle down | C．stick to | D．team up with |
He knows so much about Russia that he's universally acknowledged as a(n) _____ on Russian affairs.
| A．authority | B．routine | C．privilege | D．boundary |
The first few years in the 21st century ______ the rapid rise of China as a world economic power.
| A．witness | B．has witnessed | C．will witness | D．have witnessed |