根据括号中所给的汉语提示写出单词,使句子意思完整。
He made a__________( 决定)to accept the challenging task..
I hurt my_______(膝盖),and it’s painful when I walk.
It’s__________(必需的) to drink eight glasses of water every day.
Mo Yan is a famous________(作家).
He was so_______(瞌睡的) that he could hardly keep his eyes open.