¿Cómo está usted? Is the blank
When you say "gusta" is when you like a certain thing like food or something you like to do. When you say "gustan" is when you like a thing like a car ect.
You could put "Yo soy/Soy" in the blank space.
I know this really good website called SpanishDict. It is a English to Spanish dictionary. It is 100% reliable. This will help you in future Spanish classes.