Since many insects have already become()to DDT, scientists have to look for some new insecticide
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Attendance at football matches have()since the coming of television.
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Since we have words to express our thoughts, nonverbal communication is not important for us.
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Sales have gone up every year since we started.自开业以来,销售量逐年下降。
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I have worked here since I __________ (graduate) from college.
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Many families have their own cars.
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____ have you been at this factory? --I've been here since 1993.
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I have not heard anything from him since his _______.
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Robots have been used in industry since ______.
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Since you have broken the law, you won't escape ______.
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Planning so far ahead () no sense since so many things will be changed by next year.
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Since 1908, secondary-school enrollments have______.
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General elections in New Zealand have been held about every______years since 1879.
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Many thousands of designs have been created since a profile bust of Queen Victoria was adopted for the Penny Black in 1840. (翻译)
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Where Have All the Bees Gone?Scientists who study insects have a real mystery on their hands.A11acro...<br/>What is the mystery that researchers find hard to explain?()
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Too many natural materials _____ since the beginning of this century.