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)
1. What may happen if people are not ______ with fire? (care)
2. The sun gives us light and ______. (hot)
3. The twins want to be ______. (fireman)
4. Some dinosaurs are ______ than the tigers. (danger)
5. Fire hose reels are ______ equipment. (firefight)