1) This book _______ as a series of lectures about shipwrecks, which were given two decades ago. a) original b) originality c) originally d) originated 2) If you weren't so __________ of Ben, he'd be happier to spend time with you. a) critical b) criticism c) critically d) criticize 3) When shopping online, many people use price _____________ websites. a) comparing b) comparison c) comparator d) comparable 4) Microsoft made several _________ to the new operating system before they release it. a) improving b) improvements c) improve 5) She met all the _______ demanded, so she got the job. a) requirements b) requires c) requests 6) It is not __________ for school balls to take place at the beginning of the term. a) uncommon b) commonly c) common 7) Safety _____ at underground and train stations has been heightened because of the bomb threats. a) regulate b) rules c) regulations d) regulars 8) The government has set up an __________ program to curb smoking. a) ambitioning b) ambition c) unambitious d) ambitious 9) _____________ believe saving the world is an easy task. a) environmentalists b) environments c) environment d) environmentals

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