句型转换（共10个空，每空0.5分，满分5分）
Going to sleep early is important for the teenagers.
__________  _________  _________  for the teenagers to go to sleep early.
You should read more English books.
You  ________  _________ read more English books.
He had to stay up late last night because he hadn’t recited NCE.(改为否定句)
He ________  _________  _________ stay up late last night because he had recited NCE.
If it doesn’t rain tomorrow, we will climb Baiyun Hills.
We will climb Baiyun Hills _________ it _________ tomorrow.