19. _____ is a sudden, violent shaking of the Earth’s surface.
A. Mudslide B. Tornado C. Thunderstorm D. Earthquake
20. They used ________ past this pagoda when they were at primary school.
A. walking B. to walk C. walk D. walked
21. Emergency workers ____ the village when the river flooded the area.
A. evacuated B. put out C. provided D. scattered
22. If we ______ the air, more people will have breathing problems.
A. polluted B. polluting C. pollutes D. pollute
23. The noise pollution results ____ hearing loss.
A. at B. of C. in D. to
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