giải giúp mình bài số 8

1. My dad offered to buy me a new laptop, which was very generous of him.
2. We have a very economical air-conditioning system, and we don't pay much money in the exhibition halls.
3. There were displays of new inventions in the exhibition halls.
4. Marconi was the inventor of the radio.
5. Satellites are used to develop global communication, not a computer.
6. The iPad is a mobile computing device.
7. It is cheaper if you book your train tickets in advance.
8. The school offers a wide range of educational and sporting activities.
9. This is a safe and convenient way to dispose of chemicals.
10. With suitable software you can use your computer as a word processor.