Here are the completed sentences for Exercise 6:

1. I feel tired, **and** I feel weak.
2. The Japanese eat healthily, **so** they live for a long time.
3. I have flu, **but** I don’t feel very tired.
4. You should eat less fast food, **or** you can put on weight.
5. You can go and see the doctor, **or** you can go to bed now and rest.
6. The Japanese eat a lot of rice, **and** they eat lots of fish, too.
7. I want to eat ice cream, **but** I have a sore throat.
8. You should eat less fast food, **or** you can put on weight.
9. The Americans often eat fast food, **so** many of them are overweight.
10. You can walk, **or** you can ride a bike to get there.

For Exercise 7, here are the combined sentences:

1. You may have an allergy, so be careful with what you eat and drink.
2. Tom has a temperature, and he has a sore throat.
3. I want to buy another car, but I have no money.
4. It’s raining, so I will stay at home and sleep.
5. I pass the test, therefore my parents took me to the cinema.
6. I feel sleepy; however, I must finish the report.
7. His shoes are worn, for he has no socks.
8. I wanted to buy a set of Lego, so I started to save my money.
9. I enjoy visiting many different countries, yet I wouldn’t want to live overseas.
10. I couldn’t go to your party, for I was tired.