10.Peter said he was sorry he         the key.

A.lost             B.had lost     C.loses            D.lose

11.My history grade was so         that my father was very angry         me.

A.disappointing; with   B.disappointhing; on   C.disappointed; with    D.disappointed; at

12.The thin air made the climbers         sick.

A.to feel            B.felt        C.feel              D.feeling

13.When did you finish your         exams?

A.end of year        B.end-of-year’s    C.end-of-year        D.end-of year