根据句意，写出括号内所给单词的适当形式。
It's my cousin's ____ (twenty) birthday next week.
The weather in Nanjing is ____ (pleasant) in summer. It's always too hot.
People screamed with____ (excite) when the match began.
He was so tired that he fell____ (sleep) soon after he went to bed.
，
，
，则（ ）