第二节：语法填空（共10小题，每小题1.5分，满分15分）
Many people keep small fish as pets. 36 keep them in a tank of water, which is made of glass. People can look through it. They can see inside the tank 37 watch the fish.
The fish need room. They need oxygen to 38 (breath). There must be enough water 39 all fish. So the size of the tank is very important.
In the tank people put small plants 40 are good for fish. They give oxygen to the water. Plants help in other ways, too. They can hide among the plants and lay eggs there.
The fish must be kept in water all the time. Some can jump high. 41 the tank should be covered with enough water. This keeps the fish from 42 (jump) out.
The fish need food and should 43 (feed) every day. But 44 you give them too much food, it is very bad, for the extra food will fall to the bottom and make 45 water dirty. So the fish should get just enough food and finish it in ten minutes. Nothing should be left .
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