Air and the sun's rays create much distortion, and whatever tends to _____ their influence is useful to the astronomer.
| A．exclude | B．eliminate | C．extinguish | D．impose |
The more one is the English-speaking environment , the better he or she will learn the language .
| A．exposed to | B．filled in | C．caught on | D．kept up |
—Thank you so much for helping me with my English .
—.
| A．With pleasure | B．A pleasure |
| C．I’m glad to hear that | D．No thanks |
It is your own fault you are so tired . You oughtn’t to have stayed up so late .
| A．when | B．how | C．where | D．why |
—The paint on the doorhas to dry for another two days.
—Yes. I doubt if the painters have read the directions.
| A．also; still | B．yet ; already | C．still ;yet | D．even ;yet |
With all the magazines I needed,I left the post office.
| A．buying | B．to buy | C．bought | D．to be bought |