补全对话 （共5题，每题1分）
根据对话内容在空白处写出恰当的句子，使对话意思完整。所写句子应与所给的标点符号一致。
A: Good morning, Miss Li.
B:                        . Liu Li.  You look unhappy. What’s wrong（怎么了）?
A: My classmates don’t make friends with me.                     ?
B: You should talk with them first.
A:                    .What else can I do?
B. Maybe you should take part in class activities.
A: OK. And?
B: When your classmates are in trouble,                     .
A: Good idea.
B: Trying your best(尽你最大的努力) is the best.
A: Thank you very much, Miss Li.
B:                         . Many happy days!