________ to find a job after graduation from college, he had to depend on his parents for a living．

A．Being not able

B．Not being able

C．To be not

D．Not to be

It was raining hard, but by the time the class was over, the rain ________．

A．had stopped

B．was stopping

C．stopped

D．would stop

Only when ________ to explain ________ the reason for this．

A．did he start; she realized

B．he started; did she realize

C．did he start; she had realized

D．he started; had she realized

Nuclear ________ be really dangerous at times even though it's a nice energy in general．

A．shall

B．can

C．should

D．must

People from all over the world ________ China on the successful launch of Tiangong－1．

A．celebrated

B．greeted

C．congratulated

D．enjoyed

After walking in the Shanghai World Expo for a whole day, my legs ________ under me and I couldn't walk any farther．

A．gave up

B．gave out

C．gave in

D．gave away

The course normally attracts 20 students per year, ________ up to half will be from abroad．

A．in which

B．for whom

C．with which

D．of whom

If I have any further news, you will be the first person ________．

A．to know

B．known

C．knowing

D．knew

Tom went to open the door．________, his father began to wash dishes．

A．However

B．Nevertheless

C．Besides

D．Meanwhile

If I were in ________ position of the mayor, I wouldn't allow ________ factory like this standing on the bank of the Yangtze River．

A．the; a

B．the; 不填

C．a; the

D．/; the