—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
Everyone except Tom and Jim ________ the film twice.
Lucy had few close friends. So she didn’t know ________ about the trouble.
--- Where is Mr. Smith? --- He ________ Guangzhou. He ________ there for a week.
---Your father’s never been to other countries, has he? --- ________. He plans to go abroad for a second time.
--- What do you think of my answer to the questions? --- Sorry. I ________ about something else.