根据句意，写出括号内所给单词的适当形式。
【小题1】It’s my cousin’s twentieth (twenty) birthday next week.
【小题2】The weather in Nanjing is unpleasant (pleasant) in summer. It’s always too hot.
【小题3】People screamed with excitement (excite) when the match began.
【小题4】He was so tired that he fell asleep (sleep) soon after he went to bed.
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解析：
【小题1】在描述某人生日时，要用序数词，twenty的序数词为twentieth。
【小题2】根据后文内容It’s always too hot.可知答案为unpleasant
【小题3】with为介词，后接名词，故选excitement。
【小题4】fall asleep，表示入睡的意思。