They ________ two free tickets to Canada.Otherwise,they’d never have been able to afford to go.
Eric was well prepared for the computer test so that he could be positive about passing it on his first________.
The dead rate is _____ pigs and recovery usually ______ within 7-10 days. A low in; occurs B. rich in;happens C. high in; came about D. poor in;took place
_____ three influenza type A virus subtypes(子类型) have been found in pigs.
_____, experts point out that students can easily fail at starting their business because of a lack of preparations.
It has always been the _____ of our government to encourage graduates to start their business.