—Is that your model plane? — No, it's his, is on the sofa.
—Why not________your teacher for help when you can’t finish________the story by yourself.
—Hurry up.It’s almost time for school.—Don’t worry.We are sure to be at school________.
Recycling is good,so don't________bottles or newspapers.
—It’s hot today,isn’t it?—Yes,it is.Why not________your jacket?
—Please________the tap if you don’t use water.—OK.It’s a way of saving energy.