True or False: During the Classical Period flutes, oboes, clarinets, horns and trumpets were added to the orchestra.

TRUE

Explanation:

The orchestra became standardized. The Classical orchestra came to consist of strings (first and second violins, violas, violoncellos, and double basses), two flutes, two oboes, two clarinets, two bassoons, two or four horns, two trumpets, and two timpani.

your word would be isle.

isle is an island or peninsula especially a small one.

if you add the letter "a" you get aisle, which is a passage between 2 rows of something like chairs, shelves, or something else.