22 - think of 'built' as indicating an anagram with the answer being a type that you might see on the High St. (trying not to give away too much)
18, 19 is a long anagram, so once you have the first 4 words, there isn't much left and if you google the phrase you will see it.
20 is an anagram
26 is explained elsewhere but the think of another way of saying 'that must have cost a mint'.
And to the opera - think South / American / girl's name.
Same is further down in the thread.
Good luck.