补全对话。

A: Hello. 1. __________________ .Dad?

B: Me, too.

A: But you look worried.  2. __________________?

B: I got a "C" in the English exam.

A:3. __________________

B: I think English is too difficult for me. I don't understand why we Chinese students have to learn it.

A: You know, 4. __________________.

B: You're right.  Though it's very useful, it's too hard.

A: It's hard, but it's important.  5. __________________

B: Really? It's very kind of you.  I'll try harder.

1. _________2. _________ 3. _________4. _________5. _________