问题详情：
补全对话
根据下面的对话情景，在每个空白处填上适当的句子，使对话意思连贯、完整。
A:Hello,Li Lin! You look upset.1____________________________？
B:I had an accident and broke my bike..
A:2.____________________________ did it happen?
B:This morning.
A:3.________________________?
B:I rode too fast on my way home and knocked into a tree.
A:Riding fast often causes accidents.4._______________________________
B: Sure,I you help me repair my bike?.
A:5._________________________’s go.
【回答】
’s wrong/the matter/the trouble/up/the problem (with you)?
2.I’m sorry to hear that.
did it happen?
must ride slowly next time/...
course,I can./No problem/OK...
知识点：补充句子
题型：补全对话
