If you don’t know the answer to something, you say: “______”
His sister wanted to have him ____ the radio, but he had had it ____ already.
——You are leaving your school. How do you like it?——Very much, of course, I ______ this school since I moved here.
There was going to ___ a struggle between her two friends. She doesn’t know __ to deal with it.
——Must I park my car behind the cinema?——No, you . You park it here.
——_________ should your robot need_________ batteries?——Every two months.