Since most Antarctic rocks are dark in color, they stood out _____ the white background and are easy to identify and collect.
A. against B. on C. beyond D. above
No sooner had I come to the office _____ the boss told me that I was fired.
A. when B. after C. than D. before
Not only _____ a promise, but also _____ it.
A. did he make; he kept B. he made; he kept
C. does he make; does he keep D. he has made; has he kept
Have you adapted _____ in a different country?
A. to living B. to live C. living D. in living
He won’t wear a hat _____.
A. however cold it is B. how cold it is
C. however it is cold D. however cold is it
It was not until mid-night _____ he went back home after the experiment.
A. when B. / C. that D. before
