语法填空题

语法填空题
Many people keep small fish ____1____ pets.They keep them in a tank of water.The tank is made of glass.People can _____2____ through it.They can see inside the tank and watch the fish.
The fish need room.They mustn’t be crowded.They need ____3____ to breathe.______4____ must be enough water for all fish.So the size of the tank is very important.
In the tank people put small plants _____5_____ are good for fish.They give oxygen to the water.Plants help in other ways,too.They can hide _____6____ the plants and sleep,lay eggs there.
The fish ____7____ be kept in water all the time.Some can jump high.So the tank should be covered.This keeps the fish _____8_____ (jump) out.
The fish need food and should be fed every day.But ______9____ you give them too much food,it is very bad,for the extra food will fall to the bottom and make the water dirty.So the fish should get just enough food and finish _____10____ in ten minutes.Nothing should be left.
第二个是填look through,为什么不能填see through呢?第六个填的是among,为什么不可以填 in 或 behind呢?第八个为什么是jumping