按要求完成句型转换，每空一词。
It’s nine o’ clock.(就划线部分提问)
_______ ____  ________ is it?
They can play the piano, the violin and the guitar. (改为一般疑问句)
________ they play the piano, the violin ________ the guitar?
I want to join the music club. (对画线部分提问)
________ ________ do you want to join?
The girl is a teacher.(就划线部分提问)
_____ is the girl's ____?
I think Tom is at home. (否定句)
I _________ think Tom _________ at home.