Read the passage and choose the best answer 

When you (25) ………..  in Singapore, you can go about (26) ……………….. taxi, by bus, or by underground. I myself prefer the underground (27) ………………. it is fast, easy and cheap. There are many (28) ……….. and taxis in Singapore and one cannot (29) ………….along the road quickly and without many stops, especially on the Monday morning. The underground is therefore usually quicker than taxis (30) ……… buses. If you do not know Singapore very well, it is (31) …………….. to find the bus you want. You can take a taxi, but it is expensive than the underground 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.