By the time he was 4 years old, he ________ 100 English words.
A. learns B. will have learned C. has learned D. had learned
Normally, if you have a/an __________ on your car, you needn’t pay for your repairs.
A. insurance B. arrangement
C. treatment D. emotion
She fell and ________ her shoulder, so she couldn’t go to work.
A. wounded B. harmed C. injured D. hit
—Listen, someone is knocking at the door.
—I ________ it.
A. should answer B. will answer C. answer D. have answered
The atmosphere gets thinner and thinner ________ the height increases.
A. while B. since C. as D. for
Studies show that people are more_______to suffer from back problems if they always sit before computer screens for long hours.
A. likely B. possible C. probable D. sure
