Read the following passage and mark the letter A, B, C, or D to indicate the correct answer that best fits each of the numbered blanks.

Public transport

Shimizu company want to offer 3-day holidays in a space station, which will be bigger than the International Space Station. However, holidays in space will be very (21) ______________! About 90,000 dollars for three days! Shimizu believe that there are enough people who will be ready to pay the price.

Other firms, in Japan and (22) ______________ USA, want to open hotels on the moon! Trips to the moon will be even more expensive!

The Japanese firm is quite serious; but they cannot yet start (23) ______________ their orbiting hotel. First they will have to buy a commercial reusable shuttle. Today there are no shuttles. The old American shuttles, (24) ______________ Atlantis and Columbia, were very expensive to launch. They had to be launched into (25) ______________ with a big rocket which cannot be reused. Tomorrow's shuttles will take off and land on their own, probably like aeroplanes.

However, holidays in space will be very (21) ______________! About 90,000 dollars for three days!