Based on the clue 'a certificate exchangeable for cash or merchandise', what is the answer?

Based on the clue 'a certain piece of hardware is una vite so this ha...', what is the answer? Based on the clue 'a certain rabbit could tell you this medium weight...', what is the answer? Based on the clue 'a certain sea commander is the namesake of this br...', what is the answer? Based on the clue 'a certain small german city on the neckar must hav...', what is the answer? Based on the clue 'a chain of office is part of the regalia of this d...', what is the answer? Based on the clue 'a chain of shoals known as adams bridge stretches ...', what is the answer? Based on the clue 'a challenge to any optician these giants had only ...', what is the answer? Based on the clue 'a chambermaid does it to your pillow forgetful act...', what is the answer?