Having taken our seats, ______.
| A．the professor began the lecture |
| B．the lecture began in no time |
| C．we were attracted by the lecture immediately |
| D．the bell announced the beginning of the lecture |
He was _____ by his grandparents, so his parents seemed to be strangers to him.
| A．brought out | B．brought down | C．brought in | D．brought up |
Mr. Smith was thinking about how to explain to the manager why he was late for work, when a good idea ______ to him.
| A．happened | B．brought | C．occurred | D．struck |
___________ he has limited technical knowledge, the old worker has a lot of experience.
| A．Since | B．Unless | C．As | D．Although |
Your hand is dirty. It needs ____________.
| A．to wash | B．to be washing | C．being washed | D．washing |
I couldn’t do my homework with all that noise .
| A．going on | B．goes on | C．went on | D．to go on |