The song I Believe I Can Fly tells us that believing in _______ is very important.

If you don’t keep your words all the time , your best friends won’tyou any more .

__________ if they have the party today?—Half the class won’t come.

There is _____ river at the foot of the mountain(山). _____ river is dangerous.

Be quiet, the head teacher Mr. Gu is coming.— Don’t worry. It _____ be him. Mr. Gu is much fatter.