补全对话。

A: I'm anxious, because I  1  find my backpack.

B: Really? 2  did you drop it?

A: I think I  3   it during the concert.

B: So it  4  still be in the symphony hall. Go there to have a look. By the way, 5  are you so anxious?

A: Because I have a math test  6  algebra tomorrow.

B: Oh, terrible.

A: It's  7 that it counts 30%  8  the final exam.

B: I'm  9 to hear that.

A:   10  you have any ideas, please call me.

B: OK. I will.