题目内容
______ convincing an argument is, it needs support of evidence.
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Earthworms occur ______ adequate moisture and food and the necessary soil conditions are found.
______ we gave him anything to eat, he would save it up for his little brother.
The reason I plan to go is ______ if I don’t.
He gave ______ came to the store a pamphlet in which his products were described.
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