Tornadoes are known to have higher winds than tropical cyclones, (31) _________ tornadoes are much smaller. As a (32) _________, a tropical cyclone can be hundreds of kilometres wide, with destruction occurring in different degrees depending on which part of the cyclone hits the land. In contrast, tornadoes are usually less than a few hundred metres wide. These storms are (33) _________ destructive in the smaller areas in which they hit, but they are also short-lived. Tropical cyclones develop in areas where the seawater is warm and there is instability in the atmosphere. (34) _________ as tropical depressions, they begin to gather strength. As they are developing, they begin to rotate, with the differences in humidity and air temperature (35) _________ them until sufficient wind speeds are reached to be classified as a tropical cyclone. 31. A. so B. however C. therefore D. but 32. A. estimation B. evaluation C. consideration D. comparison 33. A. incredibly B. slightly C. relatively D. jokingly 34. A. Starting B. Starting out C. Commencing D. Beginning with 35. A. increasing B. heightening C. strengthening D. promoting