1. It's very exciting to live on Mars
2. This is the third time I have ever been to this restaurant
3. You won't need computers because your TV will do everything
4. Peter may not come to the party tonight
5. I didn't have your number, so I couldn't phone you
6. He has been learning English for 3 years
7, Da Nang is one of the richest cities in Vietnam
8. In spite of the noise, we continued to study our lesson