______ time goes by, China is getting stronger and stronger.
-Someone’s knocking at the door. Is it your mother?-No, dad. It _____be mom. I saw mom ____in the bedroom just now.
He is new here. He has few friends here, _____ ?
-- We can’t find Jim anywhere. Where is he?-- Perhaps he _____ home.
Alice likes music _____ is quiet and gentle, because it can make her_____.
_____ hard work it is! But the students are working hard to finish it as soon as possible.