笔试部分 （100分）
Ⅰ. 单项选择（15分）
( )21. I often do exercises ____ the morning, but ____ Sunday morning I listen to the radio.
A. in; on B. on; in C. in; at D. on; at
( )22. There ____ snow in Canada every year.
A. has many B. has much C. are many D. is much
( )23. Don’t speak loudly. He ____ now.
A. sleeps B. slept C. is sleeping D. are sleeping
