This is not my book. It is         .

 --- “Why don’t you go to the Science Museum?”  ---“I hear there’s ______ in it.”

----Can he work out the maths problem? ----I think _____ hard for him to work it out.

—Who is the man over there?—He is an old friend of _________ .

 I agree with most of what you said. But I don’t agree with___________.