What does the word "it" as used in the phrase "by selling it" refer to?

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 26 to 30.

Tourism is one of the world's largest industries, and it is the fastest growing. It contributes over £50 billion to the economy annually, over £12 billion of it from overseas visitors. About 25 million overseas visitors come to Britain each year. Tourism is one of the biggest employment (26) ____________in the UK, too - it employs over 1.7 million people, which is more than in the construction or health service industries.

Around 20% of all new (27) ____________are in this industry. These figures are very impressive, but how do they translate into job possibilities for you? There is room in this industry for all sorts of people, with different educational (28) ____________, personal attributes, interests and career aims. A tourist is really a traveller - someone who (29) ____________a journey, usually for recreation, like a holiday or sightseeing. (30) ____________, tourism at its very simplest refers to the industry that provides travel and entertainment facilities for people away from their own homes.

Rather than____________about how tired she was, she got on with her job.

She left her husband after a____________row.

After she had had a couple of glasses of champagne____________she started to feel____________.

Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions.

The doctor (A) advised him to avoid (B) eating fatty foods, (C) having more fresh vegetables and drink (D) much water.

Nobody wants to help him, ____________?

Mark the letter A, B, C, or D on your answer sheet to indicate the option that best completes each of the following exchanges.

Hoa: "Would you mind closing the door?" - Hung:" ____________."