In the house where I grew up, it was our custom to leave the front door on the latch at night. No one carried keys. Today

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问题     In the house where I grew up, it was our custom to leave the front
door on the latch at night.  No one carried keys.
    Today doors do not stay unlocked, thus for part of an evening. The【S1】________
era of leaving the front door open has gone forever. It has been replaced
of by  locks, security  chains, electronic alarm systems and tripwires【S2】________
hooked up to a police station or private guard firm. Many suburban
families even have sliding glass doors on their patios, with steel bars
elegantly building in so no one can pry the doors open.【S3】________
    A recent public-service  advertisement by  an  insurance company
featured not actuarial charts or a picture of a child’s bicycle with a【S4】________
padlock attached to it.
    It is the insurance companies which pay for stolen goods, but who【S5】________
is going to pay for that the new atmosphere of distrust and fear is doing【S6】________
to our way of life? Who is going to make the psychological payment for【S7】________
the transformation of America from the Land of the Free to the Land of
the Lock?
    For some reason  we are satisfied when  we think we are well-
protected; it does not occur us to ask ourselves; Why are we having to【S8】________
barricade ourselves for our neighbors and fellow citizens,  and when,【S9】________
exactly, did this start to take over our lives?
    Even a decade ago,  most private businesses had a policy of
free access.  Thus, today you have to carry some kind of access card to enter【S10】________
your place of work. Maybe the security guard at the front desk knows
your face and will wave you in most days, but the fact remains that the
business you work for feels threatened enough to keep outsiders away via
these "keys".
【S2】

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答案去掉of

解析 介词冗余。be replaced by是固定搭配,意为“被……代替”,of多余,应去掉。
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