Though ______, many laws of nature exist.
-- How do you get on with your classmates?--____________
-- Which do you prefer, oranges or apples? -- __________ . I' d like bananas.
-- Oh, no, we've missed the 8 o'clock train! --________ . There's another one in half an hour.
--_______________? -- Orange, I think.
-- Hello! Is that Mr Wang speaking? --Yes,____________?