阅读下面材料,在空白处填入适当的内容(不多于3个单词)或括号内单词的正确形式。 Many people keep small fish {#blank#}1{#/blank#} pets. They keep them in a tank (鱼缸) of water. The tank {#blank#}2{#/blank#} (make) of glass. People can look through it. They can see inside the tank and watch the fish.
The fish need room. They mustn't be crowded. They need oxygen {#blank#}3{#/blank#} (breath). There must be enough water for all fish. So the size of the tank is very {#blank#}4{#/blank#} (importance).
In the tank people put small plants {#blank#}5{#/blank#} are good for fish. They give oxygen to the water. Plants help in other ways, too. They can hide {#blank#}6{#/blank#} the plants and sleep, lay eggs there.
The fish should {#blank#}7{#/blank#} (keep) in water all the time. Some can jump high. So the tank should be covered. This keeps the fish from {#blank#}8{#/blank#} (jump) out.
The fish need food and should be fed every day. But if you give them too much food, it is very bad, for the extra food {#blank#}9{#/blank#} (fall) to the bottom and make the water dirty. So the fish should get just enough food and finish {#blank#}10{#/blank#} in ten minutes. Nothing should be left.