- The engineers in this lab spent several weeks _______their plans for the new bicycle.
- Many kinds of animals are believed to have _________from the earth
- The _______ work continued for more than a week but there was still no sign of the missing boy.
- He _______ to study harder in the future so that he could have more opportunities to find a better job.
- He tried to _____ __relations with his former wife but he failed.
- Much of the news provided by this newspaper is_______, not foreign.
- The doctors _______ the medicines to the people in the flood area.
- We are _______ at the rapid progress Mark has made in this semester.
- She is already 16years old. But she _______as if she were still a little girl.
- This river forms a natural _______ between China and Korea.
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