根据下面的对话情境，在空白处填上一个适当的句子，使得对话完整。
T: Hi, Long Yufeng! You look so sad.                             ?
A: I failed the English exam.
T:                     . But you don’t need to worried about it all the time.
A: I really don’t know how to study English well.                         ?  
T: I think you’d better study in a group.
A: Oh,                     . Could I join your group?
T: Of course you can. And we can learn from each other.
A: Sounds good.                  ?
T: You can join it tomorrow, if you like.
A: That’s very kind of you.