第一节单项选择（本题共15小题，每小题1分，计15分）从每小题所给的A、B、C、D四个选项中选出可以填入空白处的最佳答案。
21. —Look! There is a monkey eating ________ apple in the tree. —En, ________ monkey is very cute.
A. a; a B. a; the C. an; an D. an; the
22. —Excuse me, is this ________ new pencil sharpener? —Yes, it’s ________. He bought it just now.
A. Tom’s; his B. Tom; his C. Tom’s; hers D. Tom’s; yours
