Вставить(something,anything,nobody,everybody) dont tell it.its a secret. eaten all the ice-cream i in our class is honest .thets why we i am not a perfectionist the office . that water is necessary for life,

Don't tell anyone about it. It's a secret.
Someone ahs eaten all the ice cream.
I think nobody in our class is honest. That's why we trust nobody.
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Everybody knows that water is necessary for life.