1. How about playing playing volleyball for a change? (SHALL) 

Shall we play volleyball for a change?
2. Do you want to go for lunch now? (WOULD)

Would you like to go for lunch now?
3. Can you tell me the way to the nearest post office? (HOW)

How can I get to the nearest post office?
4. The first question in the test was easier than the second one. (DIFFICULT)

The first question in the test was not as difficult as the second one.
5. I expected my exam results to be better. (THAN)

My exam results will be better than I expected.
6. The bookstore is at the side of the grocery store. (NEXT)

The bookstore is  next to the grocery store.
7. Dave doesn't earn as much money as his wife. (MORE)

Dave's wife earns much more money  than he does.
8. Could you close that window, please? (MIND)

Would you mind closing that window?