二、单项选择（共15小题，每小题1分，计15分）
从A、B、C、D四个选项中选出一个可以填入句中空白处的最佳答案。
21. —What makes you so ________ today, Jack? It is your first day of school.
—Because my teacher says I am ________ honest boy.
A. happily; an B. happily; a C. happy; a D. happy; an
22. —My grandmother is over 97, _________ she is still very healthy.
—Yes, I think so.
A. and B. but C. or D. so
