She raised her finger to her lips as _____ for silence.
| A．an idea | B．a mark |
| C．a sign | D．a word |
___________ 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 |
Would you please tell me the quickest way English well?
| A．to learn | B．A or D | C．how to learn | D．of learning |
in a white uniform, he looks more like a cook than a doctor.
| A．Dressed | B．to dress | C．Dressing | D．Having dressed |