(    )16. Look! There’s _______football under the teacher’s desk. Let’s play _______football , OK?

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

(    )17. ——You look so tired. Why _______ for a walk ?

     ——Good idea.

A. not go   B. don’t go       c. not to go     D. to go

(    )18. The boy likes to sleep with his parents. He is______ the dark.

A.interested in   B.afraid of  C.sure of      D.terrified