________ in the queue for half an hour, Tom suddenly realized that he had left his wallet at home.

A. To wait　

B. Have waited　

C. Having waited　　

D. To have waited

The beautiful ________ beyond the mountain was so beautiful that the tourists couldn’t _____themselves away from it.

　　 A. scenery; tear　 B. view; take　 C. sight; keep　 D. places of interest; pull

Happy birthday, Alice! So you have ____________ twenty-one already.

　 A. become　 　　　　B. turned 　　　　　C. grown　 　　　　D. passed

-–They ______ have prepared for the meeting more carefully.

　 --- But they didn’t . What a pity!

　 A shouldn’t B can’t C may D ought to

The field research will take Joan and Paul about five months; it will be a long time _____ we meet them again.

A. after　　　　　　　 B. before　　　　　　　　　 C. since　　　　　　　 D. when

Increasingly, over the past ten years, people--- especially young people –have become aware of the need to change their eating habits, because much of the food they eat, especially processed food(加工过的食品), is not good for the health. As a result, there has been a growing interest in natural foods: foods which do not contain chemical additives(添加剂) and which have not been affected by chemical fertilizers(化肥), widely used in farming today.
Natural foods, for example, are vegetables, fruit and grain which have been grown in soil that is rich in organic matter. In simple words, this means that the soil has been nourished(给…营养) by unused vegetable matter, which provides it with vitamins and minerals. This in itself is a natural process compared with the use of chemicals and fertilizers, the main purpose of which is to increase the amount—but not the quality—of foods grown in commercial farming area.
Natural foods also include animals which have been allowed to feed move freely in healthy pastures(牧场). Compare this with what happens in the mass production of poultry(家禽)：there are battery farms, for example, where thousands of chickens live crowded together in one building and are fed on food which is little better than rubbish. Chickens kept in this way are not only tasteless as food; they also produce eggs which lack important vitamins.
There are other sides of healthy eating which are now receiving increasing attention from experts on diet. Take, for example, the question of sugar. This is actually unnecessary food. It is not that sugar is harmful in itself. But it does seem to be addictive: the quantity we use has grown steadily over the last two centuries and in Britain today each person consumes an average of 200 pounds a year! Yet all it does is provide us with energy, in the form of calories. There are no vitamins in it, no minerals, and no fibre.
1. People have become more interested in natural foods because______.
A. they want to keep healthy
B. they want to taste all kinds of foods
C. natural foods are more delicious than processed foods
D. they want to return to nature
2. Chickens raised in poultry farms are all of the following EXCEPT that _____.
A. they are fed on food which is little better than garbage
B. they live in very crowded condition
C. the eggs they produce lack vitamins
D. they are allowed to move about and eat freely
3. According to the passage, ______.
A. people can only find sugar to give them energy
B. sugar is bad for the health
C. the use of sugar is habit forming
D. sugar only sweetens food, but provides us with nothing useful

　Robert and Peter study in the same university. They do everything together and help each other. But they often play jokes on each other.?

The school year was over last month and they decided to travel through the country in ?America. They drove a car and could stop wherever they were interested in and started whenever they wanted. Of course they enjoyed themselves. It was very hot one day and they were both hungry and thirsty. They stopped in front of a restaurant by the road. They came in, sat down at a table and ordered some dishes. Robert looked around and found there was a small bowl on the table. He thought there was some ice cream in it and took a spoonful of(一匙)it and put it into his mouth. Immediately he knew it was mustard(芥末),but it was too late. Tears ran down his face, but he pretended nothing had happened. The other young man, seeing his friend crying, asked, “What are you crying about, Robert?”?

“I’m thinking of my father who was hanged twenty years ago,” was a reply.?

After a while Peter made the same mistake. Tears ran down his cheeks(面颊),too. And his friend asked him why.?

“I wonder why your father hadn’t been hanged before he got married!”?

1. Robert didn’t tell Peter it was some mustard in the bowl because　　　　 .?