2. When a volcano ____(1)____, hot gases and melted rock from deep within Earth find ____(2)____ way up to the surface. This material may flow slowly out of a crack in the ground, or it may explore suddenly into the air. Volcanic eruptions may be very destructive. But they can ____(3)____ create new landforms. Of the nearly 1,900 volcanoes active today, or known to have been active in historical times, about ninety per cent can be found in the areas of South America, North America, Asia, and Oceania that are close ____(4)____ the Pacific Ocean. When marked on a map of the world, this line of volcanoes looks a bit like a vast, open circle. For this ____(5)____ it is known as the ring of fire.
1. A. blows B. throws C. comes D. erupts
2. A. they B. their C. them D. theirs
3. A. also B. too C. so D. but
4. A. at B. with C. to D. on
5. A. aim B. condition C. way D. reason
1D
2B
3A
4C
5D
1đ
2b
3a
4c
5d