what does el es el mejor novio de todos mean my girlfriend speaks spanish idk what she said

What is an appropriate response to ¿cuánto cuesta?

Llena el espacio con la forma del verbo que se escribe correctamente. mi mamá me cinco dólares para gastar en el mercado.

Okay so i'm taking an online spanish course (penn foster), and in the study guide, you have to create a bunch of sentences with words you've learned so far. translating, reading, and those kinds of things are fairly easy, but when it comes to making my own sentences, my brain just kinda waltz's away. anyone got any tips?