—What can we do to________ bird flu from spreading?—Try not to buy or eat chickens that have not been checked.A. prevent B. cause C. discover
--Is this ________ English book? -- No, it’s my book.A. he B. she C. her
-- What’s this________ ? -- It’s a pen.A. in English B. at English C. English
-- What’s this? -- __________ English book.A. It’s a B. It’s an C. This’s a
-- Is tiffs your ruler? -- No, _________.A. this is B. it isn’t C. it’s not
Look! The traffic is moving fast. It’s _____ dangerous ____ cross the street now.