---Is_______ necessary to learn another language? --- I think so.
–I don’t understand ____. --I’m sorry. But I was doing my homework.
--This history book is of great value.--Exactly. However, ____can be enjoyed from it _____you have a deep understanding of it.
--Could you tell me _____ on the Internet?--Of course I______.
--What useful___ they are!--Yes. There is so much important ____ in today’s newspaper.
The ___man told us his past days before he___. His ____ made us very sad.