阅读下面短文，根据所给语境，按要求完成下列各题。
Many of the expressions using water haven’t enjoyable meanings in English.
“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 (敌人) attacking a town. ①That 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, serous or not so serious. A person who breaks a rule 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.
“Water over the dam(水坝)” is another expression about a past event. It’s something that finishes and it cannot be changed. The expression comes from the idea - water has run over a dam and it cannot 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.”
“Throwing cold water” 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.
小题1:阅读短文，并把①处的句子翻译成汉语。
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小题2:阅读短文，完成下面的句子（每空一词）。
When you say “It’s water over the dam.” to your friend, you want to tell him to __________the __________ he has made.
小题3:用文章中关于“water”的英语短语填空，并使句子通顺。
Your friend invites you to go hiking, but you don’t want to. You can _____________________ on the idea.