______ have you been learning to play the violin?—Since I was rive years old.

Is there uniform on the sofa? –No, there is on the desk.

As middle school students, we _____ the police to keep order.

I was scared _______ when I saw the tiger jumped out of the cage and ran to the little child.

Could you please have a walk with me?—Sorry, I _______. I have something important to do now.