一、单项选择（15小题，每小题1分，共15分）
请从各题后所给的A、B、C、D四个选项中选择最佳答案。
1.When I met Mike, he was only______ that year.
A. ten years old B. ten- years-old C. ten-year old D. ten years old
2.He thought the window glass was broken_____ the boy hit it, but in fact it was ____the strong wind.
A. because of ; because B. because; because of
C. because; because D. because of ; because of
