1. We can either get online or watch TV to get access to the great changes taking place in the world.
2. The children are told not to spend too much time (in) playing video(online) games.
3. He thinks that the novel is worth reading again.
4. Do you know how far Mars is from the earth?
5. A lot of work (which is) dangerous to us can be done by robots in the future.
6. The boy is not yet of an age to deal with such problems on his own.
7. The trees in forests prevent the soil from being washed away directly by the rain.
8. Bill Gates teaches us how to solve business issues with new methods.
9.David quit(gave up) his job in San Franscico Library.