I. Choose the word or phrase among A, B, C or D that best fits the blank space in the following passage.
Camping is an activity in which people live temporarily in the outdoors. Campers (1) ________ in fishing, hunting, swimming, plant study, wildlife watching, and nature photography. It provides physical benefits when it involves hiking around a campsite, and many people believe that camping (2) ________ youngsters feel more confident.
People throughout the world enjoy hiking to wildness campsites. This activity is called backpacking because it involves carrying such essential camping gear as (3) ________ tent, food, clothing, and sleeping bag on the back in a bag (4) ________ a backpack. Backpacking is best suited for (5) ________ who are in good physical conditions as it may require walking several miles.