Experts say walking is one of the best ways for a person to _____ healthy.
| A．preserve | B．stay | C．maintain | D．reserve |
相关试题
Although there were so many people in the square, I could _____ my friend.
a. pick up B. pick out C. make up D. pick away
---What do you thin of the book?
---Oh, excellent. It’s worth _______ a second time.
| A．to read | B．to be read | C．reading | D．being read |
What they need most _____ money while what we need most _____ textbooks.
| A．were; is | B．are; is | C．was; are | D．is; are |
Neither Tom nor Jack and I ______his students, but each of us _____ gone to
the hospital to see him.
| A．am; has | B．is; has | C．are; has | D．was; have |
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