Problem: Does "When housing prices decreased, homeowners in ARMs then had little incentive to pay their monthly payments, since their home equity had disappeared." answer the question "What type mortgages allowed homeowners to make interest-only payments?"

A: no

Problem: Does "Canada has the world's largest deposit of natural bitumen in the Athabasca oil sands and Canadian First Nations along the Athabasca River had long used it to waterproof their canoes." answer the question "For what did Canadian natives use asphalt as a waterproofing material?"

A: yes

Problem: Does "The 20th century saw the arrival of Modernism, and along with it came the most prominent Portuguese painters: Amadeo de Souza-Cardoso, who was heavily influenced by French painters, particularly by the Delaunays." answer the question "In which century did Portugal see the arrival of Modernism?"

A:
yes