Complete the sentences with the given words in their proper forms (用括号中所给单词的适当形式完成下列句子，每空格限填一词)
1. Please remember to brush your ______ before sleeping. (tooth)
2. It is ______ to ride a motorcycle fast at night. (danger)
3. ______ use nets to catch fish and prawns in the deep sea. (fish)
4. You have to find someone who can fix the ______ tap. (drip)
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