—May I smoke here?
—Choose a seat in the smoking section, if you ________.
| A．should | B．must | C．can | D．may |
The old man came ______ to the railway station, only ______ the train was slowly pulling out of the station.
| A．and ran; found | B．running; finding | C．running; to find | D．to run; finding |
Now that there is much difficulty in finding a satisfying job, why don’t you do a ______ job to support you for the time being?
| A．temporary | B．contemporary | C．permanent | D．essential |
Seeing the chemical ________ to the sunlight, Mr. Lee warned the workers to be careful when dealing with it.
| A．to expose | B．exposing | C．exposed | D．being exposed |
On Friday, we were packing to leave for a weekend away __ my daughter heard cries for help.
| A．after | B．while | C．since | D．when |
It took ______ people as well as ______ time to build the pyramid.
| A．a large number of; a great many | B．a great many; a large amount of |
| C．a great many of; large amounts of | D．a large amount of; a great deal of |