早上老师上课时,同学们应该说:________。
—_______ does Mary surf the Internet? — Every day. A. How long B. How many C. How often
Mr. Li is one of _______ best engineers in this factory. A. the B. an C. A
There ______ a soccer game in our school tomorrow afternoon.
Mike is looking forward to the Great Wall next month.
If he goes to the party, he ______ a great time.