English Skills 7: Cloze passage

The biggest animal in the world lives in the sea. The whale is often mistaken for a [animal/mammal/fish/dolphin] because it lives in the sea and [moves/looks/wriggles/travels] like a fish. Actually, it is a mammal. Like man, it is warm-blooded and does not [breath/breathe/perspire/sniff] through gills. The whale need air, so it swims to the [surface/top/summit/sea] for air from time to time to breathe. When it does so, warm air is [washed/taken/sniffed/blown] out. When this warm air mixes with the surrounding cold air, a [fountain/spout/spray/mist] is produced. The spout is actually a spray of mist. The biggest [group/hybrid/type/species] of whale is the blue whale. Although it is large, it does not [eat/feed/cling/swallow] on smaller fish or other sea creatures. Instead it feeds [by/on/with/for] plankton. On the other [hand/angle/corner/instance], the killer whale, which is the smallest species of whale, feeds on fish, seals, penguins and even other whales. [That/An/A/This] interesting fact about killer whales is they can be [tamed/organised/tied/killed] in captivity. Killer whales have been trained to [dance/perform/action/advice] in a number of marine parks or water-worlds all over the world. They are indeed clever at performing tricks. They have also been featured in movies, one of which as ‘Free Willy’.