The key answer of exercise 5

In each case as or though can be used with no difference in meaning.

1. New as / though I may be to a city, it doesn't take me long to master the transport system.
2. Keen coffee-drinker as / though I am, I don't like this fashion for really milky coffee.
3. Lonely as / though I sometimes feel in a new place, I generally make friends quickly.
4. Real fashion victim as / though I am, I draw the line at shaving off all my hair.
5. Difficult as / though it can be driving in a new town, I'd rather hire a car than walk.