II. Choose the correct answer A, B, C, or D to fill in each blank in the following passage.

There are a lot of pastimes that young people like, and one of ___(1)___ is mountain climbing. It is an active leisure activity that people can do either indoors or outdoors. If you go climbing outdoors, it is a great way to ___(2)___ your strength and enjoy nature at the same time. You can even set up your own climbing wall in your backyard or ___(3)___ your home. This way you don’t have to go out and still can ___(4)___ fit and enjoy the activity.
So how can you start mountain climbing? Many people take a class to learn how to climb and use their equipment ___(5)___. others join climbing clubs to make new friends with the same interest and go climbing together. If you are an active person and like outdoor activities, ___(6)___ don’t you try this activity?