Writing / Making Correct Definitions

_____________ is a state of matter that has no fixed shape or volume.

This definition is correct in terms of grammar: "Opera are dramatic performances set to music."

__ is a mathematical expression made up of variables, coefficients, and exponents, combined using arithmetic operations.

The sentence pattern of basic definition is "_________ + LINKING VERB + COMPLEMENT".

This definition is correct in terms of sentence pattern: "A long-term profession or pursuit of work is called career."