She will tell us why she feels so strongly that each of us has a role _____ in making the earth a better place to live in.

Tom, where is your father— I’m not sure. He_______ in his office.

__________ you say goodbyeso soon —- I’m sorry Mymother is expecting me at home

I found my new school quite different from _____ I hadstudied in before.

I think the book is as interesting as it is instructive．—— It could never be____．It is well worth reading．