8.

1. His father doesn't father

Neither does his father

2. Fast food isn't either

Neither is fast food

3. Her sister won't either

Neither will her sister

4. That supermarket doesn't either

Neither does that supermarket

9.

1. Traveling by plane is different from traveling by train

2. Jane's car is as nice as Kate's car

3. Fruit juice is good for your health. So is tea

4. Tim's weight is the same as Hung's weight

5. This picture is beautiful but so expensive

10.

1. I do -> do I

2. but -> and

3. more best -> better

4. do -> does

5. neither -> either