He felt ______ to work for human rights and progress.
| A．it his duty | B．his duty | C．that is a duty | D．that is his duty |
Shortly after the accident, _____ policemen were sent to the spot to keep order.
| A．score of | B．two scores | C．score | D．scores of |
Although he knew little about the work done in the field, he succeeded ____other more experienced experimenters failed.
| A．which | B．that | C．what | D．where |
There is a small object _____ a pin on the desk.
| A．resembling | B．resembling with | C．resembled | D．resembled like |
His uncle went abroad in 2010, and __________ since.
| A．had not been heard of | B．has not been heard of |
| C．had not heard of | D．has not heard of |
It's a rule for all the students to _____ their places ahead of 5 minutes waiting for the class to be started.
| A．take up | B．pick up | C．keep up | D．give up |