词形转换

The girls are all ________(frighten)of the dark．

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The teacher tells us it’s ________(polite)to shout at people．

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Look at the sign．You should go in from the ________(enter)to the supermarket．

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When the girl heard the news, she got very ________(excite)．

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The old man helped him by ________(provide)money for his study．

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They ________(greet)each other with a smile on that day．

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Some students still don’t know the ________(important)of learning English．

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Giant pandas are ________(protect)animals．

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He came into the room ________(quiet)because his baby was asleep．

用括号中所给单词或中文的适当形式填空

Who will be the ________ to speak at the meeting this afternoon？(第三)