Read the following passage and mark the letter A, B, C, or D to indicate the correct word that best fits each of the numbered blanks.

     An earthquake is shaking, quaking or trembling of the ground. An earthquake (23) ________when two blocks of the earth hit, bump or slide past one another. You feel the ground shaking. Small and big earthquakes happen all the time on land and in ocean. The ground shaking that happens under water can cause big (24) ________called tsunami.

     What do we need to do during an earthquake? If you are inside a house or a school hide under a bed or a desk and stay there (25) ________the quaking stops. Stay away from the stairs, windows, walls and furniture because they might collapse and hurt you. Don't go to the kitchen and don't (26) ________a gas stove because it might cause fire.

     If you're outside, go to open grounds (the nearest school's ground or square). Stay away from buildings, trees, power lines and other big things that might fall on you. If you are in the car or on the road, stay inside your (27) ________until the shaking stops. The driver should stop on the side of the road far from big objects or buildings.