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

World Earth Day is celebrated on April 22 every year. Gaylord Nelson first introduced the concept of Earth Day in the year 1970. The oil spill in Santa Barbara in 1969 severely harmed animals and plants in the ocean and on land. After this, Nelson wanted a special day to (33) ......... awareness and protect nature. At first, people in the US celebrated it, but now the whole world takes part. More than 193 countries are now celebrating this day, and people get (34).......... _ in environmental preservation activities on this day. It is celebrated in (35)............... schools and colleges by performing dramas and other activities with the theme of ecological preservation.