— Look! The girl with long hair is drawing a picture. Is she Sandy?— It ______ be her. I’m not sure.
I didn’t know when he _____ back. He said he would call me when he _____ home.
Four days __________ enough for us. We still need ________ two days.
The big fire hasn’t been __________ yet?
We will never forget those happiest days _______ we spent on the summer camp.
We wondered __________ this afternoon.