根据汉语意思完成单词。

1. we may get a headache when we can't get _____ (足够的)sleep.

2. Jane is a young girl, but she's very _____ (勇敢的)

3. LiMing _____ (讨厌) to play with those bad boys

4. You shouldn't work on the______(因特网)too long

5. Water is _____ (必要的)for us.