1．(2019·山东日照一模)Researchers guess that too much thinking ________ (consume) a lot of energy from the brain.
答案：consumes 根据前面的主语“too much thinking”可知，谓语动词应该用第三人称单数。
2．(2019·广东普通高等学校招生全国统一考试模拟)They used more than 4,200 pounds of flour to create ________ (hundred) of loaves and sheets of sweet bread.
答案：hundreds 这里表示“数以百计的”，故填hundreds。
3．(2019·北京市门头沟高三一模)About 50 observation spots ________ (be) designed for the tourists throughout the city.
答案：are/were 根据前面的主语“About 50 observation spots”可知，谓语动词用复数形式，故填are/were。
4．(2019·四川省棠湖中学高三二诊模拟)After he took a ________ (two) glance, a thought crossed his mind.
答案：second a＋second表示“又一；再一”，故用second。
