1. Air ......................., together with littering, is causing many problems in our cities today. A. pollute B. pollution C. polluting D. polluted 2. The road in front of my office is always ....................... when it rains heavily. A. to flood B. flooding C. flood D. flooded 3. Over decades, vaccines have save a/ an ....................... number of lives. A. little B. big C. many D. enormous 4. Ive been working in the ....................... of medical science for nearly ten years. A. work B. field C. job D. career 5. The roof of the building ....................... in a storm a few days ago. A. damaged B. was damaged C. has damaged D. has been damaged 6. There would be much less pollution .............. people stopped using cars completely. A. because B. if C. though D. despite 7. As soon as the flood water ....................... down, people ....................... their houses. A. went - cleaned B. had gone cleaned C. went - had cleaned D. had gone had cleaned 8. We should not .......................password with anyone. A. send B. bring C. share D. lend 9. When the policeman came there, the robber ....................... A. had left B. has left C. left D. was left 10. All people who were without homes in the flood were provided with ....................... accommodation. A. short B. temporary C. present D. instant 11. Seven of ten people prefer face-to-face ....................... when having a date. A. language B. contact C. code D. sign 12. Australia is home to ....................... animals like kangaroos and koalas. A. only B. rare C. unique D. precious 13. Edison took out a/ an ....................... on the light bulb. A. paper B. invention C. patent D. technology 14. If the factory ....................... dumping poison into the lake, all the fish and other aquatic animals will die. A. continues B. continued C. will continue D. continue 15. You will recognize Jenny when you see her. She ....................... a red hat. A. wears B. is wearing C. will wear D. will be wearing 16. Robots save workers from ....................... dangerous tasks. A. making B. having C. performing D. carrying 17. Many people believe that robots have made workers jobless ....................... that is not necessarily true. A. but B. and C. so D. or 18. Recent ....................... developments have made robots more user-friendly and intelligent. A. science B. scientist C. scientific D. scientifically 19. Mary said she ....................... in NASA. A. intends working B. intends to work C. intended working D. intended to work 20. Sciences and technology have enormous ....................... on economic development. A. affects B. effects C. affect D. effect