When you are in trouble(麻烦), you can _________ help _________ the police.
He has been running______.
We’ve been _____ for her for 5 hours.
_____ you study, _____ grades you will get.
There isn’t ______ in the room.
-When shall we go to Hong Kong for holiday? - I am not sure yet. _______ this Sunday ______ next Saturday is ok.