---Who is the tallest boy? ---It ______ be John. John is of medium height.
Kate and I _____ doing ______ homework now.
Listen! Someone _____ songs.
Bob is ________ at the map to find where Beihai Park is . A, looking B. looks C. looked D. look
I think your mother is_____you at the school gate at the moment.
Put the clothes on because it gets ____outside.