21.   The only catch, if there is one, is price.

22.   The only catch, if there is one, is that she is a filly.

23.   The only catch is finding a small bit of well-preserved mammoth tissue containing normal DNA.

24.   The only catch is he must keep winning.

25.   The only catch is that the five-week production ends this weekend, so time is of the essence.

26.   The only catch is that the loan cannot exceed the fair market value of the house.

27.   The only catch is that the opera is almost impossible to cast satisfactorily.

28.   The only catch is they must be accompanied by an adult.

29.   The only catch is, the characters are make-believe.

30.   The only catch, all along, has been the risk that the memory chipmakers would come up with their own solution.