Can I say,

(a)    I quickly took (a) quick action to save the girl.

(b)   When they arrives there, they saw the bookstore was crowded with people.

The bookstore sold a variety of interesting books, magazines and more / others.

(c)    At the moment, there was a large crowd lining up at the reference book store to buy books.

(d)   A famous bookstore in Shanti’s town was holding a sale to sell off the old books. On that day, many people mostly students came because there were many reference books sold in there,

(e)    They tried to squeeze into the crowd but they failed to do so. Because of the heat, Susan fainted in the crowd.

Vincent Teo wrote:

Can I say,     (a)    I quickly took (a) quick action to save the girl.  You should not use both quickly and quick in the same sentence. One or other: I quickly took action  OR I took quick action (b)   When they arrived there, they saw the bookstore was crowded with people. The bookstore sold a variety of interesting books, magazines and more / others.other items. (c)    At the moment, there was a large crowd lining up at the reference bookstore to buy books.  "At that moment, there was..." OR "At the moment, there is a ...." (d)   A famous bookstore in Shanti’s town was holding a sale to sell off the old books. On that day, many people, mostly students, came because there were many reference books sold in there,being sold. (e)    They tried to squeeze into the crowd but they failed to do so. Because of the heat, Susan fainted in the crowd.  ok