根据下列句子的意思及所给的汉语提示，写出空缺处单词、固定短语或固定搭配的正确形式。 1. Nancy didn't come to school because of her __________ (疾病). 2. If you are not careful enough, you can __________ (容易) make the same mistake. 3. I often hear her ___________ (说话) in low voices in class. 4. Don't be worried about it. These children can ___________ (照看) well here. 5. I study English by ___________ (写日记).