【2013兰州】Do you know a spaceship flies at about nineteen kilometers _______ second?
She likes eggs, meat __________ milk, but I don't like meat, milk __________ eggs.
Tom and Mike enjoy __________ TV.
It's very dangerous __________ football in the street.
-- ________ you tell me how to write it in English? -- I'm sorry, I can't.
Look! They ________ in the hallway.