Since earthquakes may cause great destruction,we need to learn how to (1)______them quickly. Animals always give us(2)______. For example, before an earthquake hens would not enter their cages;rats run out from their hiding places and march fearlessly through houses; evennormally quiet dogs bark in chorus all over town. Pigeons are (3)______noisyand fly in unusual patterns. And most (4)______is a chemical change in groundwater before a quake.. To prevent destruction of (5)______, thearchitects design columns and horizontal beams of equal strength. (6)______ theefforts to improve building structures , people also should prepare theirhouses for the(7)______ of a great earthquake. It is (8)______ to check and (9)______ their homes regularly. And remember to place heavy objects in lowpositions, attach cupboards and cabinets (10)_______ walls, and so on. All theseprecautions can make a great difference in saving lives and preventing the loss ofhomes.