Many years ago, most of our earth wascovered with blocks (块) of ice. These iceblocks were as tall as high buildings in modern cities. Most of the ice was inthe northern part of the world. Then the ice blocks started to move south. Coldand rain came with the ice. Animals had to move. At last, the ice began to melt(融化). After half a million years, most of it melted.More than half of the earth became covered with water. Theclimatebecame much warmer. Things began to grow. The earth began to look the way inwhich it looks today.

Feet are an important part of you. Without them, you couldn't stand up, walk or run around. Your feet work so hard that sometimes they get sweaty (出汗).

Think of a hot summer day when you have been walking around all afternoon. Your feet have been in those trainers for a long time! The moment you take off your shoes, you feel good and relaxed, but your feet smell bad. You may think it is because of the sweat. But in fact, sweat itself has no smell. It's the bacteria (细菌) on your skin (皮肤) that mix with it and gives off a bad smell.

Bacteria love dark and wet places like the inside of sweaty shoes. The sweatier you get, the more bacteria there will be. When you wear your shoes, bacteria will have a good meal on your feet. They eat dead skin cells from your skin and then leave a kind of waste called organic acids (有机酸). These organic acids smell bad. Things will become better if you wear cotton socks.

 Do you know the grass in the picture? It is a kind of grass for cats. It is good for your cat. Are you a cat lover? Do you want your cat to be healthy? Then you can plant this kind of grass at home. Please find the following steps. 

 What you need:

A small planter (花盆)

 Potting soil (盆栽土)

 Water

 Seeds (种子) ( You can buy them at any plant store. )

▲:

 Fill the planter with the soil. Water the soil until it is a little wet. Throw seeds across the top layer (层) of the soil, and then press (按) them into the soil. Water the soil again. Keep the soil wet until the seeds begin to sprout (发芽) — about one or two weeks. Then water is needed 、 When your seeds grow tall enough, you can invite your cat to taste it. 

{#blank#}1{#/blank#}"Because" and "so" shouldn't be put together. But some students often add "so" to the sentence with "because".

{#blank#}2{#/blank#} Some students may be lucky to get the right answers. But if they depend only on luck failure may come.

{#blank#}3{#/blank#} Some students pretend that they know the grammar rules but in fact, they don't.

{#blank#}4{#/blank#} Students need to learn a lesson from mistakes so that they won't make them next time.

{#blank#}5{#/blank#} A Some students seem to be able to recite(背诵)the English texts in groups. But if they asked to do it alone, they can't.

A. The old emperor liked group music. A man knew this and joined the music team. But the new emperor enjoyed the music played by every single musician. Theman without any music ability was afraid and ran away.

B. Several men were drawing snakes on the floor. One man was the first to finish a snake but he didn't win because he added feet to his snake

C. One day, a rabbit knocked itself into a tree and fell dead. A farmer nearby enjoyed the rabbit for dinner and waited for more at the same place every day. However, no rabbits came and his fields went worse.

D. A man wanted to steal a big bell next door. However, he had to make a lot of noise so he covered his ears with pieces of clothes, thinking if he couldn't hear the noise, neither could others.

E. A sheep keeper found a sheep was gone and he discovered there was a hole in the sheep hold(羊圈). So he fixed it right away. As a result, the rest of the sheep were safe.

F. A hard-working young man was so poor that he had to make a small hole in the wall to get light from next door at night. He read a lot of books and became an important officer for the emperor.