Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the option that best fits each of the numbered blanks from 18 to 22.

In 2007, design graduates, Joe Gebbie and Brian Chesky, ___(1)___. Hearing that there was a conference coming to town and there were no hotel rooms available, they created the website airbedandbreakfast.com ___(2)___. Only six days later, they had three guests sleeping on their floor. They knew immediately that this was the start of something big.
Being budding entrepreneurs, ___(3)___. They enlisted Gebbie's former flatmate, Nathan Blecharczyk, a computer science graduate, to develop their website. Their idea was to target conferences and festivals across the USA, getting local people to list their rooms and travelers to book them. ___(4)___. Within a week, they had 800 listings, an achievement which dealt in part with the shortage of hotel rooms, but did not solve their financial problems, as the site was not making any money.
The team decided that they would have to handle payment for the bookings. ___(5)___. Meanwhile, investors had started showing interest in the company. By April 2009, when larger investments began to arrive, they moved the company out of their flat into a new state-of-the-art office and hired more staff.
Since then Airbnb has gone from strength to strength. The company now has over 1.5 million listings in 34,000 cities in 190 countries, and is rumoured to be worth around $20 billion.
(Adapted from Friends Global)