Ответ:

3. The weather was great! It was a beautiful day although there were a few clouds in the sky.

5. Together with a friend of mine we are going to spend a little time in the Alps. After that we'll go to the seaside.

6. Her husband is a sailor. He spends weeks at sea.

7. The winter of 1993 was quite warm and mild. In fact, it was the warmest winter of the 1990s.

8. If you open your textbook on page 78, you'll see the rule I'm talking about.