---Is this your ruler？---______.
A .Yes,it's B.Yes, it isn't
C.No, it isn't D.No,it is
----Your backpack is very nice.
----________.
A.Yes B. No C.Thank you. D.Sorry
-- _______.Is this your book?
A. Sorry B.Thanks C.Excuse me D.No
___are his sisters.
A. She B. He C.They D.That
Linda and I ____friends.
A.Be B.am C.is D. are
Thank you ____your pencil.
A.at B. in C. for D. of
