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7. It takes three hours to drive from Hanoi to Nam Dinh.
8. I wish you had told us about this.
9. The owner of the house is thought to be abroad.
10. The sea was too rough for the children to go swimming.

Ex8/
1. How long have you known him?
2. They had a three-day trip.
3. In case it rains hard this afternoon, take the rain coat with you.
4. She forgot to do the washing up.
5. It is easy to learn English.
6. If you don't leave the lights on all night, you won't waste electricity.
7. It was such old furniture that we couldn't keep it.
8. No one else in Gary's class plays the guitar better than her.

9. Since the computer was invented, people have saved a lot of time.
10. Everybody needs to clean up their neighborhood once a week.