第二部分 英语知识运用
一．单选题（共20题，每题1分）
21.______ number of students are playing on the ground but I don’t know what _____ exact number is.
A. A, the B. The, a C. A, a D. The, the
22. My plane at 8:30 am, so I home at 8:00 tomorrow morning.
A. leaves; leave B. leaves; am leaving
C. is leaving; am leaving D. is leaving; leave
