单选题 Hydroelectric power plants ______ electricity in a much cleaner way than coal-fired ones.

单选题 ______ living is the practice of providing for your own needs without outside aid Or resources.

单选题 You may have already seen your dream house. Before you ______ an offer, you can do a few more things to ensure you purchase the right property for the right price.

单选题 We were deeply shocked and saddened when we ______ of the sudden death of our newly retired professor.

单选题 A central heating and cooling _____ produces warm or cool air in one central area and distributes it throughout the building.

单选题 It’s long been proven that we can ______ any project if we break it up into small pieces and do the project one piece at a time.

单选题 A native New Yorker, Ben is ______ with the city, its neighborhoods, and all he has connections with.

单选题 If you’re in business long enough, it’s inevitable you will experience ______ and hardships.

单选题 The idea was to have users upload their medical records, so that they could be ______ at any time.