根据下面句子的意思及所给的汉语提示，写出空缺处的单词或词组的正确形式。
1. If you are ___________ (粗心的), you'll fail the exam.
2. He looks very young, but he's ___________ (实际上) 55.
3. Can you guess how old my grandfather is? We have just celebrated his ___________ (第九十九个) birthday.
4. When I don't know a word, I often ___________ (查它) in the dictionary.
5. When he heard the cry for help, Danny quickly ___________ (穿衣) and ran out to the man.
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