15.He slept very well for first two nights, but on third night, storm blew up.
 
He slept very well for the first two nights, but on the third night, a storm blew up.
\n 15.He slept very well for first two nights, but on thi - Unit 12 Adverb clauses - 英语语法与写作 - U校园 | 大学网课搜题引擎