Scientists are now beginning to conduct experiments on _______ trigger different sorts of health risks. A. Noise pollution B. That noise pollution C. How noi

Scientists are now beginning to conduct experiments on _______ trigger different sorts of health risks. A. Noise pollution B. That noise pollution C. How noise pollution D. How noise pollution can 3. The Apollo 11 astronauts _______ of the Earth's inhabitants witnessed on the famous first moonwalk on July 20, 1969, were Neil Armstrong and Buzz Aldrin. A. Whom B. Whom millions C. Were some D. Whom some were 4. At the end of the nineteenth century, Alfred Binet developed a test for measuring intelligence _______ served as the basis of modern IQ tests. A. Has B. It has C. And D. Which has 5. _______ have at least four hours of hazardous materials response training is mandated by federal law. A. All police officers B. All police officers must C. That all police officers D. For all police officers