.Some students often listen to music___classes to refresh themselves.
This river has changed its course many times. It _________ always located where it ________ at present.
I,who____your friend,will try my best to help you with your English.
--Where is your brother? ---I think he is still in_____bed,but he might just be in______bathroom.
It was____to watch small childen play games.
I remember___for the job,but I forget the exact amount.