一、用方框中所给词的适当形式完成句子。

easy low busy large old long young interesting
1. He is much ________ than usual because the final exam is coming.
2. The Yellow River is China’s second ________ river after the Yangtze River.
3. Peter is ________ than his sister May.
4. — It is said that elephants are the ________ existing land mammals(哺乳动物) on the Earth.
— But elephant populations have fallen sharply.
5. Asking questions is one of the ________ ways to lead you to active learning.
6. Travelling by train is slower than by plane. But it’s ________ than by plane.
7. China is one of the ________ countries in the world. We are all proud of it.
8. — More and more people like group purchase on the Internet.
— You said it! The prices are much ________.

一、1. busier　2. longest　3. younger　4. largest 5. easiest　6. more interesting　7. oldest　8. lower

二、根据汉语意思完成句子。
1. 海伦唱得很动听。我从来没有听过(比这)更好听的嗓音。
Helen sings beautifully. I’ve never heard ______________.
2. 随着世界人口正变得越来越多，我们不得不做点事情来应对这种情况。
As the world’s population ______________，we have to do something to deal with the situation.
3. 我妈妈比我爸爸小两岁。
My mother is ______________ ______________ ______________ my father.
4. 彼得比他班里的其他任何一个男孩都高。
Peter is taller than ______________ ______________ ______________.
5. 三项运动中，游泳是最有趣的。
Of the three sports，swimming is ______________.
6. 孩子们越早学会独立，对他们的未来就越好。
______________ kids learn to be independent，______________ it is for their future.
7. 这是这家商店里最贵的电脑。你可以买一台较便宜的。
This is ______________ in the store. You can buy ______________.
8. “中国有5 000多年的历史。它是世界上最古老的国家之一。”
“是的。它的历史比美国(的历史)长得多。”
— China has a history of over 5,000 years. It’s ______________ in the world.
— Yes. It has ______________ the USA.

二、1. a better voice　2. is becoming larger and larger 3. two years younger than　4. the other boys/any other boy in his class　5. the most interesting 6. The earlier; the better　7. the most expensive computer; a cheaper one　8. one of the oldest countries; a much longer history than