is/are made of or are used for

is made of 

2   muchos

A,AN, ANY, SOME/ THERE IS OR ARE/ PREST SIMPLE OR CONTINUOUS/ THIS, THESE, THAT, THOSE/

 A, AN, SOME, ANY

a, an, some, any

Muchos ejercicios de there is/are

Muchos ejercicios de this, these, that, those

Muchos ejercicios de present simple or continuous

Juego de routinas    routines