--If you have any trouble, be sure to call me.---______________.
________of the land in that district________ covered with trees and grass.
—What do you think of the film“Avatar”? —________.—It’s fantastic.The only pity is that I________ the beginning of it.
—Maggie,I really love your handwriting.—________.
—I wonder_______ you’ll water this kind of tree. —Once a week.
We can have_______ bluer sky if we create________ less polluted world.