上课铃响了，教师走进教室，班长应该说：
A.Please come in.
B.Good morning.
C.Stand up.
当经介绍后认识某人时，你应该说：
| A．Good morning. |
| B．Please sit down. |
| C．Thank you. |
| D．Nice to meet you. |
晚上分手时所用礼貌用语是：
A.Hi!B.Hello!C.Good night!
下午与同学见面，你应说：
A.Good afternoon.B.What’s your name?C.How are you?
The box is __________ than that one.
A.more heavierB.heavyerC.much heavier