Do you like animals? Do you want to keep animals? Yes, many people like animals and want to keep a lovely animal as a （71） p_____. It's a pity that they don't have a suitable place to keep them. However, keeping fish may be the best choice.
Why keep them?
People keep dogs and cats because they enjoy their friendship. Fish can not be friendly, but they have beautiful shapes and colors. It's a pleasure to watch as they swim （72）i_____ their tank（水槽）.
What do they need?
First of all, the fish need a suitable （合适的） tank, and you must fill the tank （73） w_____ suitable water. It is also good for （74） t_____ to have a few water plants in the tank to keep the water pure （纯净）. Putting a few snails （蜗牛） in the tank is a good （75） i_____. They will keep it （76） c_____
What about feeding them?
There are many kinds of fish food （77） t_____ you can get in the shops. Most are suitable for all kinds of fish. You should feed your fish only （78） o_____ a day. It is important not to give them （79） t_____ much food. Just give them as much as they can （80） e_____ up in about 15 minutes. This will keep them healthy.
答案：71．pet 72．in 73．with 74．them 75．idea 76．clean 77．that 78．once 79．too 80．eat
76. If a Chinese lives in a f________ country , be or she is called an overseas Chinese .
77. Why didn't you do your homework ? Students are s_________ to do their homework , you know .
78. I have been playing volleyball for bours . Now I'm so tired and t_______ . Could you get me some water ?
79. It's not p________ to look amund when you are speaking to others .
80. Most people agree that eating fruits and v_________ is good for health .
答案：76.foreigh 77.supposed 78.thirsty 79.polite 80.vegetables