Thegovernmentcalledoutpolicementosuppresstheriot.
A
to suppress the riot 在句子中是作目的状语，表示“警察来是镇压动乱的”，所以答案为 A。
Thepolicemancameuptothelonelyhousewiththedoor_______,_______thereforawhileandthenenteredit.
Chinaisamountainouscountry.Hills,mountains,andplateauscover_______ofthetotalarea.
______thenewplancanbecarriedoutwillbediscussedatthemeetingtomorrow.