Read the following text carefully and choose the correct answer A, B, C or D for each of the gap.

When you are in Singapore, you can go about (6) taxi, by bus, or by underground. I myself prefer the underground (7) it is fast, easy and cheap. There are (8) buses and taxis in Singapore and one cannot drive along the road (9) and without many stops, especially on Monday morning. The underground is therefore usually quicker (10) taxis or buses.