两个完形填空问题it tells plants when to ______ flowers and insects w

两个完形填空问题
it tells plants when to ______ flowers and insects when to leave the protective cocoon and fly away.中间空格要填form还是bloom,为什么?还有it can take many days for a human body to _______ the major change in work hours.中间空格要填accept还是adapt?为什么?
第一个空答案给的是form.第二个是accept.