I find difficult us to work out the math problems.
A. its; of B. its; for
C. it's; of D. it; for
After a short rest, the doctor carried on the next patient
A. operating B. operation on
C. do an operation on D. operating on
People running everywhere. Do you know what ?
A. see; has happened B. see; happens
C. are seen; is happening D. are seen; is happened
We students can collect food and old clothes for the homeless people, and the teachers can ________learning skills for the poor children.
A. give B. offer C. prevent D. provide
—I can't stop smoking, doctor.
一For your health, I'm afraid you .
A. must B. can C. have to D. need
This kind of bamboo can be used a fishing pole(竿).
A. for B. as C. to D. by
