16.   —Has Yang Liwei reached        Mars yet ?

       —No , not yet.But he has already been to        moon.

       A./,the                  B.the,/                 C.the,the                  D./,/

17.  The woman asked the doctor for some      .

       A.advice              B.advices                C.suggestion            D.advise

18.   —Have you      spoken to a foreigner?

       —Yeah.

       A.still                   B.already                 C.ever                     D.yet