A. are; is B.are; are

　　C. is; are D.is; is

　　答案　A解析　考查主谓一致。句意为：这所大学估计留学生的生活费用每年大约8 450美元这对一些学生来说是一个负担。第一空的主语为living expenses意为“生活费用”谓语动词应用复数形式；第二空“which ________ a burden for some of them”是一个非限制性定语从句指代前面一句话的内容故此处谓语动词应用单数。故A项正确。题眼：第二空后单数形式“a burden”是解题的关键。well as his students, ________ to perform at the opening ceremony of the 2017 Taipei Flower Expo.

　　A. were invited B.was invited

　　C. have been invited D.has been invited

　　答案　B解析　考查动词语态和主谓一致。根据题中的“2017”可知时态应用过去时；as well as his students为插入语后面的谓语动词应与“The famous musician”保持一致所以谓语动词用单数形式；又因为the famous musician与invite之间为被动关系所以应用动词的被动语态。故答案选B。________ interviewed shortly after the match for their outstanding performance.

　　A. were B.was

　　C. is D.are

　　答案　B解析　考查主谓一致和动词时态。分析句子结构可知句中主语中心词是“The basketball coach”为单数因此谓语动词应用单数形式排除A、D两项；根据“shortly after the match...”可知接受采访”这一动作发生在过去因此要用be动词的一般过去时故B。All the scientific evidence ________ that increasing use of chemicals in farming ________ damaging our heath.

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