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15.
A. Landlordandlodger.
B. Receptionistandguest.
C. Salesmanandclient.
D. Policemananddriver.
16.
A. Takethesafetyofhisparents-in-lawintoaccount.
B. Askhisparents-in-lawtomakethedecision.
C. Invitehisparents-in-lawtoasight-seeingrestaurant.
D. Buyhisparents-in-lawsomepetsinstead.