Correct a mistake

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III. Correct a mistake
1. We have never been to London, so I wish we can have a chance to visit this captital city one day.
2. When arranged marriage is common in this country, it is quite rare here.
3. I have been working hardly for two weeks and now I feel like a rest.
4. Professor Jones says that a good way to improve your language skills are practicing them frequently.
5. These televisions are all so expensive for us to buy at this time but perhaps we'll return later.
6. The chemical instructor explained the experiment in such a way that it was easily understood.
7. The man took off his shoes so as didn't make a noise when he entered the room.
8. Medical students must study all the theory and practice of medicine.