He is very angry with his mother, because his mother always     him with the best student.

－Where is your father ? －He is at work . He always has lots of work __________ . 

If you want to listen to music, please _______ the radio first. 

–Don’t ________too late,or you will feel tired in class. --I won’t ,Mum.Good night!

 But much of the world’s water ____ from rivers and lakes.