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根据短文内容，完成下列各题。
Many of the expressions using water have
different kinds of meanings in English. "Throwing cold water on an idea"
means "not to like an idea". For example, you want to buy a new car
because the old one has some problems, but your parents throw cold water on the
idea, because they think a new car costs too much.
"Water
over the dam" is an expression about a past event. It's something that has
finished and it can't be changed. The expression comes from the idea—Water
has run over a dam and it can't be brought back again. When a friend is
troubled by a mistake he has made, you might tell him to forget about it. You
can say "It's water over the dam".
"Be in hot water" was used five
hundred years ago to mean being in trouble. One story says it got the meaning
from throwing hot water down on enemies attacking a town. That happens no
longer, but we still get into hot water. When we are in hot water, we are in
trouble. It can be any kind of trouble, serious or not serious. A person who
breaks a law can be in hot water with the police. A young boy can be in hot
water with his mother if he walks in a house with dirty shoes.
