The most popular after-school _________________are football and volleyball. (act)

6.The most popular after-school _________________are football and volleyball. (act)
7.The _________________is always at her desk to help readers find their books. (library)
8.The United States‘ library of Congress is one of the world‘s _________________libraries. (large)
9.There are some big public           in my neigborhood. (library)
10.This dictionary is very _________________for you to learn English. (use)