10. base  n 基地，大本营，基础
  She used her family’s story as a base of her novel.
  His arguments had a good economic base.
  The air base was set up in 1980.
  vt. 
  Judgment should be based on facts, not on hearsay.
  One should always base one's opinions on facts.
  I base my hopes on the good news we had yesterday.

11. contact vt
  She contacted me as soon as she arrived there.
  be in [out of] contact with 和...接触， 有联系［脱离接触， 失去联系］
  have contact with 接触到， 和...有联系
  lose contact with 和...失去联系， 离开
  make  contact with  和...接触［联系］

12. survive  vi 幸存，残存，生还
  Few survived after the flood。
  The custom still survives.
  Vt 幸免于，经受得住，比。。。活得长
  He survived his wife for many years.他比妻子多活好多年。
  The house survived the storm.

13. once  conj. 一旦
  Once you begin you have to continue.
  Once you get down to doing something ,you should try your best.

14. prove vt 证明
  He has proved his courage in battle.
  Facts have proved that the creative power of the people knows no limits. 事实证明人民的创造力是无穷的。
  vi 证实（是）
  The method / drug proved (to be) highly effective.
  My advice proved to be wrong.

15. qualified adj 有资格的；合格的
  He is a qualified doctor.
  He is qualified for his job.
  qualify v 具有资格  qualification  n  资格

16. live 
 vt. He is our model .He can live his own dream by himself.
 adj. There is a live concert on TV tonight.(现场直播的)

17. keep vt.保存；保留；保守（秘密）；遵守；记录；养，供养； 保持，继续
  Keep this seat for me.给我保留这个座位。
  The old man kept it a secret from his wife until his death.这个老人一直到他死都没把这个秘密让他妻子知道。
  keep a promise/ the law/the rules遵守诺言/法律/制度
  keep a diary记日记
  He has a wife and a child to keep.他要养活妻子和孩子。
  keep“保持，继续”，常有以下搭配：
  keep+adj.
  keep doing sth.
  The baby kept crying all night.婴儿哭了一夜。
  keep“使（人）保持（某一状态）”，常有以下搭配：
  keep+sb.+adj.
  Please keep the children quiet.请让孩子们保持安静。
  keep sb. doing sth.
  I’m sorry to have kept you waiting.对不起让你久等了。
  keep sb./sth. done
  Keep your eyes shut for a while.眼睛闭一会儿，别睁开。
  keep sb.+介词短语
  We must keep everything in order.我们应该把一切放得整整齐齐。