4. ，the expedite system shall remain in operation until the end of the match. (introduce)
轮换发球法一经实行，将一直使用到该场比赛结束。
4. Once (it is) introduced考查状语从句。当状语' 从句中的主语与主句的主语相同或为it,并且谓语中有be动词时,常可省略主语和be动词。
芝麻开花课程新体验系列答案科目：高中英语 来源： 题型：
19. Every teacher and every student the development of our school in the past five years. (contribution)
每一名老师和每一位学生都在过去五年里为我们学校的发展做出了贡献。
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( ) 7. The drilling in Antarctica dragged on slowly because of lack of money, equipment breakdowns，environmental and severe cold.
A. concerns B. assumption C. occupations D. ignorance
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( ) 2, Most animals and plants are to large or sudden changes in temperature, so the ocean is a safe and comfortable habitat.
A. stable B. sensitive C. steady D. firm
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( ) 9. BP will continue to make sure that the costs with oil spill cleanup in the Gulf of Mexico are paid.
A. fascinated B. covered C. occupied D. associated
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9. It is high time that of protecting these old traditions and customs before they die out. (bear)
我们是时候应该承担起保护这些古老的传统和风俗习惯的责任来，不让它们消亡
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( ) 3. Having done my job in establishing the company，I decided that it was time I and left the work to my sons.
A. faded out B. turned out C. dropped out D. gave out
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10. All flights because of the storm，they had to wait nervously in the hall.(put)
所有的航班已经被延迟，因为暴风雨，他们不得不在大厅里等着。
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16. Fortunately somebody who happened to be passing by called the fire department . (immediately)
幸运的是，刚一起火就有碰巧路过的人给消防部门打了电话。
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