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1.people in the countryside live ... than those in the city 
A,happily B,happy C more happy D more happily 
2.it's a rule, so everyone ...strictly follow it
A,should B,shouldn't C, don't have to D,has to
3,Nick would like to know something about the ...groups of VN
A,cluture B,cultured C,culturology D,cultural
​4,Nick would like to know something about the ...groups of VN when he visited the museum of ethnology 
A,culture B,culturally C,cultural D,cultured