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.The number of cell phones in use exploded in the late 1980s and part of the 1990s. The number of traffic deaths was reduced in the late 1980s and part of the 1990s due to cell phone use. Cell phone users are likely to be involved in traffic accidents. The use of cell phones has a life-saving effect for pedestrians and drivers.
can't be must be may not be should be
the present trend is that the number of schools on the list is falling there are more schools which shake off the bad reputation this year the trend this year is not the same as that of past few years the review is not reliable
were; was were; were was; were was; was
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It had a life-taking effect because there weren't enough cell phones in use then. The increased use of cell phones then caused a "life-taking effect." Traffic fatalities increased then because the number of cell phones in use decreased. Traffic fatalities decreased then because the number of cell phones in use increased.
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