It has been ______ by dead-bolt locks, security chains, electronic alarm systems and trip wires________ a police station or private guard firm. Many _______ families have sliding glass doors on their patios, with steel bars elegantly built in so no one can _____ the doors open. It is not ____________, in the most pleasant of homes, to see pasted on the windows small notices__________ that the premises are under __________ by this security force or that guard company.