-Can I help you ?-__________ A.Yes ,I want to buy a book. B.Here they are. C.Thank you .
—Excuse me, Jack. Where is the bus?—___________.
—What is thirty and twelve?—It’ s ___________.
—__________your brother here?—__________,he isn’ t here.
—__________the bike?—Look! It’ s under the tree.
Jim and I__________ students. We__________in the same class.