—How about buying Sam a mobile phone? After all,  he isn't a boy any more.  

—I think it necessary,  for we sometimes want to make sure if he       home for dinner.  

A. will come

B. comes

C. has come

D. would come

下列各项，不属桔梗的主治病证是

A.肺痈

B.咳嗽

C.咽痛

D.痰证

E.眩晕