Obama made _______ history by being elected as ________ first black president of the US.
| A．不填；the | B．a; the | C．a; a | D．the; a |
Mary couldn’t________ the terrible working conditions in that factory and resigned last week.
| A．catch up with | B．keep up with |
| C．put up with | D．come up with |
Some passers-by witnessed the car accident ______ five passengers were killed, a baby included.
| A．where | B．which |
| C．that | D．when |
— Why do you do volunteer work in the North—West?
— I_____ to improve the lives of the children there through my efforts.
| A．was trying | B．have tried |
| C．am trying | D．tried |
I send you my revised catalogue and price list, ______ you may find something that suits you.
| A．to hope | B．hoping |
| C．hoped | D．hope |
Under the new schedule, teachers of primary and secondary schools must _____each class on time instead of adding extra lessons.
| A．cancel | B．Advocate |
| C．postpone | D．dismiss |