Just like fingerprints, each person’s DNA is ________unless he has a twin．

—The hotel business in China is as __________ as that in developed countries now.—Yes, but we still have a long way on energy saving hotels.

After the new technique was introduced the factory produced________cars in 1994 as the year before.

—Do you regret spending 500 dollars on the overcoat?—No,I would have paid _________ if the shop owner had insisted.

-Are you satisfied with her answer?-Not at all. It couldn’t have been _____.