Complete the sentences with used to or didn't use to to make true sentences. 1. to a different school. 2. this book in primary school. 3. shorter than i am now. 4. out at night when i was little. 5.my instant messaging when they were young. 6. more letters, but now we usually send emails.

1. used to
2. didn't use
3. used to
4. didn't use to
5. didn't use
6. used to

1. I used to go to a different school
2. We used to use this book in primary school
3.I didn't used tobe shorter than I am now.
4.I used to go out at night when I was little.
5.My grandparents didn't used to use instant messaging when they were young.
6.People used to write more letters,but now we usually send emails.

.    Yes, I have been on diet about one year ago.
2.    I wanted to be healthier and stronger. And losing weight wasn't the last reason, of course.
3.    I tried to lose weight a couple of times. It was quite useless.
4.    I ate a lot of fruits and vegetables (about 2 kilos a day). I think that amount of food is a very important thing.
5.   Frankly speaking, I like sweets so much. It was hard to eat less cakes and ice-cream.
6.    I think that healthy nutrition (but not starving) helps you to be strong-willed.
7.    Yes, it did. I lost 5 kilos.
8.    It didn't. Actually, I do sports a lot and I think I'm used to eating healthy food.

1.A need is something you have to have to survive or complete a task. A want is simply the desire for something, in many cases something to satisfy a need. You need food to survive.

2.In the field of behavioral economics, the term utility refers to the perceived value (i.e., usefulness) an individual receives when they purchase a good or service. There are four different types of utility: form, place, time, and possession utility.

3.We must help to anybody who fell in bad trouble to do our society better/

4.We speak with different people from different countries.Many nations want submarines. Economists say that utility determines 'the relationship between a consumer and a commodity'.

Utility varies between different people and between different nations. A vegetarian does not want meat, but may rate the utility of bananas very highly, while a meat-eater may prefer steak. A mountain-republic like Switzerland has little interest in submarines, while maritime nations rate them highly.

5.The production of pianos falls sharply in wartime.

The utility of a commodity is also related to the quantity which is available to the consumer. If paper is freely available, people will not be so interested in buying too much of it. If there is an excess of paper, the relative demand for paper will go down.

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