A. vt. (1)保留  I’ll keep a seat for you.
 (2)养活；饲养 
He has a large family to keep. He keeps some chicken.
 (3)使……处在……状态 Sorry to have kept you waiting.
   Let’s keep the door open but keep the windows closed.
   You must keep us well informed.
   Mr. Xue always keeps us busy.    
Close the door to keep the cold out.
   Let’s keep the room in order.
B. link v. 保持
  We must keep fit.=We must keep in good health.      Keep calm in time of danger.
C.习语
keep a record of登记；记录
keep a secret保密
keep watch注意；提防
keep one’s promise/word履行诺言
keep the law/rule遵守法律/法规
keep…apart使分离
keep away不接近；避开
keep…back扣下；阻止；留下；忍住（眼泪等）
keep birthday/ Christmas庆祝生日/圣诞等
keep body and soul together维持生活
keep…down控制；缩减
keep sb. doing sth. 使…….坚持做
keep silence保持安静；保持沉默
keep sth. to oneself把……据为己有
keep sb. from doing sth. 阻止；使免于；抑制
keep hold of…抓住不放
keep …in  mind记住
keep doing sth. 继续做；不断地做
keep on doing sth. 不停地做;反复地做
keep…out不许…….入内
keep out of…不参与
keep sb. company与某人做伴； 陪伴某人
keep to sth.坚持；固守（习惯等）
keep…under control使得以控制
keep in touch with…与保持联系
keep up坚持；继续
keep up with…跟上
keep watch守望；站岗