Complete the second sentence so that it has the similar meaning to the first one

Complete the second sentence so that it has the similar meaning to the first one.
1. My grandfather has to wear his glasses to read newspapers. (can’t)
2. Your health is not good, so you cannot do karate. (because)
3. Mary stayed at home yesterday because she was sick. (so)
4. The film was so boring. However, Jack saw it from beginning to end. (but)
5. The skyscrapper is higher than our office building. (low)
6. A house in the city is more expensive than a house in the country.