(    )10.After two hours’ walking, we were       .

     A.relaxed    B.excited     C.exhausted    D.interested

(    )11.Mr King said he would meet me at the airport, but he didn’t       .

     A.show up    B.stay up     C.come out    D.go out

(    )12.       , we arrived too late catch the plane.

     A.Luckily     B.Really     C.Finally     D.Unfortunately

(    )13.All of the books by the author had been        because they were very popular.

     A.gone off     B.sold out    C.broken down    D.set off