Choose the correct word A, B, C, or D for each gap to complete the following passage

VII. Choose the correct word A, B, C, or D for each gap to complete the following passage.
underground. I
When you are in Hong Kong, you can go about by taxi, by tram, by bus, or (1)
myself prefer the underground (2)
it is fast, easy and cheap. There are many trams and buses in
and without many stops. The underground is
Hong Kong, and one can not drive along the road (3)
therefore usually quicker (4)
taxis or buses. If you do not know Hong Kong very well, it is very
expensive than the underground
difficult to find the bus you want. You can take a taxi, but it is (5)
or a bus. On the underground you find good maps that tell you the names of the stations and show you how
to get to them, so that it is easy to find your way.
1. A. in
B. by
B. when
2. A. because
3. A. quick
B. quicker
4. A. as
B. than
5. A. more
B. much
C. on
C. so
C. quickly
C. so
C. as
D. with
D. But
D. quickest
D. like
D. too