根据短文内容，用方框中所给单词的适当形式填空，每词限用一次。

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Cathy: Hi, Mario, are you free next week

Mario: Hmm … next week is quite  for me, Cathy.

Cathy: Really? How come?

Mario: I have dance and piano lessons.

Cathy: What kind of dance are you ?

Mario: Oh, swing dance. It's fun! I have class  a week, every Monday. Cathy: How often do you have piano ?

Mario: Twice a week, on Wednesday and Friday.

Cathy: Well, how about Tuesday?

Mario: Oh, I have to  tennis with my friends. But do you want to come? Cathy: Sure!