用方框中所给单词的适当形式填空，每词仅用一次（每空一词）。

My son wants to go to see the          in the zoo. He thinks they are lovely.
Mr. Green ______ English in No. 1 Middle School when I was ten years old.
Do you know that Bill Gates donated（捐赠）____4____ of dollars in 2010?
If we work hard ,we will          at last.
He had to talk to          when there was nobody at home.