In the following passage, some words have been deleted. Read the passage carefully and select the most appropriate option to fill in each blank.
The air has become very dirty in (1)______ parts of the world. This is of course (2)______ to your health. Experts say many people die (3)______ it each year. There is a new study on (4)______ pollution which comes from the experts of the World Health Organization (WHO)(5)______ is an agency of the United Nations. If you (6)______ unhealthy air for long periods of time, you could (7)______ sick. Air pollution has been linked to many diseases (8)______ stroke and cancer. The WHO says that seven million (9)______ die each year as a result of the (10)______ air.
