I/ 

1. Light travels almost 300000 km in a second.

2. I dislike the idea of leaving him at home alone all evening.

3. Adult human body contains 206 bones.

4. It is a nice dress but it creases very easily.

5. Lisa and Holly have never cycled around England.

II/

1. Tom studied a lot but he didn't pass the exam.

2. He can buy the book or borrow it from the library.

3. Maria was thirsty so she drank some water.

4. He was tired and he also had a headache.

5. Neither does she drink nor eat butter.

II/

1. flowers

2. fragile

3. share

4. depression

5. expert

6. obesity

7. vegetarian

8. donated

9. traffic jam

10. volunteer.