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15、______we know, there are 107 elements found in nature.A) So long asB) As farC) So far asD)Just as
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16.This test is for students_____native language is not English.A) whoseB) thatC) of whomD) which
17、Our aim is to make the electricity ______the people better.A) serveB)servedC) to serveD) serve for
74、We all know that arrows are often used as______to show directions.A) signsB) messagesC) signalsD) symbols
19.Nobody but Smith and John _______in the lab yesterday.A. wereB. had beenC.was beD. was
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