024.
Hello, everybody. Here's an announcement about our class.
We're going to use the book Beginning English in this class. You need to buy this book. Beginning English is $23. You can buy it any day this week in the main office. Class is from 9:00 to 12:00. We have a 15-minute break at 10:30. The break is from 10:30 to 10:45. You can sit in classroom, or walk around, or go to the cafeteria. But please be back in class on time. English class in on Monday, Wednesday, and Friday mornings. Maths is on Tuesday mornings and typing is on Thursday morning. They are both from 9:00 fo 11:00. If you want to register for maths or typing, go to the main office. If you are absent, call the main office. Give your name and say you are in English 1. Tell the secretary that you cannot come to class.

答案解析：
(1) 正确答案为C。根据You can buy it any day this week in the main office. 本周任意一天均可以总办公室购买。可知，可以在总办公室购买，因此C项正确。
(2) 正确答案为B。根据You can sit in classroom, or walk around, or go to the cafeteria. 你可以坐在教室里，出去走走，或是去咖啡厅。可知，休息时间可以出去转转，因此B项正确。
(3) 正确答案为A。Maths is on Tuesday mornings数学在周二上午上课。可知，周二是数学课，因此A项正确。