问答题 《复合题被拆开情况》 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".《问题》：【S2】