4.(valued/valuable/invaluable/valueless) a.The Internet is a(n) source of information. Key:invaluable b.Their advice is very_ to the freshmen of the university. Key:valuable 4. (valued/valuable/invaluable/valueless) a. The Internet is a(n)_____ source of information. Key: invaluable b. Their advice is very _____ to the freshmen of the university. Key: valuable