A:若,则
B:若,,,则
C:若,,则____ , I'm very____ and I don't know____ .(3)从图书馆借书必须按时归还。When you____ books____ the library, you must____ on time.(4)他和他的同班同学相处的很好He is____ his classmates.(5)看上去他们完全能自己做好它。____ that they can do it____ .
牧羊人放牧,只需要管好头羊,羊群中的其他羊都会跟着头羊走,依据是羊具有( )