Dictionaries are_______useful books. People use dictionaries to_______out the meanings of words. _______you are learning English，you will use_______English dictionary. Some students have_______. Their dictionaries include Chinese and English words. They are useful，but it is usually_______to use a dictionary written completely_______English. This will_______you to think in English. A good English dictionary will show you the correct_______of a word and its pronunciation. Many dictionaries also show________a word is used in sentences.

    47     The answer for most people would be yes. But where does our rubbish go？It doesn't just sit in the rubbish bin. Every day，workers come to take the rubbish from our rubbish bins. They put it into a big truck and carry it to landfills（垃圾填埋场）. At the landfill，people sort（分类）the rubbish. They recycle some，burn some and bury some of it underground.     48     It means that less rubbish ends up in landfills. Landfills can also be bad for the environment.

So many Chinese cities encourage everyone to sort out their rubbish before throwing it away. Put the food in one bag. Put the plastic bottles in another. And throw them in the right rubbish bins. In this way，we can help save a lot of time，money and energy for all of society.     49     so they have higher recycling rates（比率）. In Sweden，only 4 percent of household waste ends up in landfills every year. In Japan，people recycle nearly 50 percent of all rubbish. There is still a lot to do when it comes to rubbish sorting in China. People in the country make about 300 million tons of rubbish every year.     50     The rest of it ends up in landfills. Most of it is unsorted. The good news is that many cities are trying different ways to make things better. Beijing will start a new program to improve rubbish sorting next year. If people sort out their rubbish，they'll get WeChat bonus points.     51    

Carrots are grown on farms and in small family gardens throughout the world. They are easy to grow and easy to harvest. They have a pleasant taste.

When people think about carrots，a picture of a long，thin，orange-colored vegetable usually comes into their minds. But carrots come in many different sizes and shapes. And not all carrots are orange.

Carrots should be grown in sandy soil（土壤）that does not hold water for a long time. The soil should also have no rocks. Weather，soil，and age affect the way carrots taste. Experts say warm days，cool nights，and a right soil temperature are the best conditions for growing great tasting carrots. Most people do not know that carrots can be grown during the winter months. If the winter is not cold enough to freeze the ground，you can grow and harvest carrots the same way as you do during the summer months. If the ground does freeze in your part of the world，just cover your carrot garden with some plant leaves or straw. This will prevent the ground from freezing.

Carrots need time to produce and develop their sugar. This gives them their taste. If they are harvested too early，they will not have enough sugar. However，carrots become wood-like and lose their sweetness if you wait too long to harvest them from the ground. The best way to decide if a carrot is ready to be harvested is by its color. Usually，the brighter the color，the better the taste.