When is World Environment Day?It’s ___________.A.on 10th September B.on 5th June C.on 22nd April
—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.