Mr.Wang gave us a lecture the other day,of which most about how the ancient city was discovered.

ince my brother graduated from the university, he _______ in the present company for 15 years and he is now chief engineer of the company .

now your potential, you have to rely onmany other people to get to where you are

Have you seen Henry lately? My boss wants to know ______.

I think _________ of the materials I listened to at the beginning of the exam __________ easy.