1.Class begins now.
2.Let's start our class.
3.Nice to see you again.(这个时间段的第一次见面，之前见过。比如，你和你的老同学今天首次见面，你们打招呼可以说：“Nice to see you!” "Nice to see you too!")
4. Who want to have a try?
5. Who can answer this question?
6. Don't be shy. Just to have a try.
7.Can you understand me?
8.Any questions?
9.Anyone else?
10.Good job!
11.Wonderful!
12.Exerllent!
13.Very good!
14.Good!
15.Class is over.
16.etc

学习了！加油！暑假好好温习

写的很好，借用一下。

看看  学习一下啊