— Have you ________ watched the dolphin show in the Ocean Park in Hong Kong?—Not _________.

---- __________is the train station from this shopping mall, do you know?---- About 30 minutes by bus.

Billy: I’ve been fixing the computer for over three hours, but it still doesn’t work. Nana: Why don’t you take a rest and try 　　　?  Maybe you’ll do better then.

--Would you like _______ tea?        --Yes, _______.