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19a too good to be criticised
20d figures of speech with an apparent contradiction
30a ice house

nonpareil
oxymorons
igloo

and I hope none of them fits your numbers of letters!!

19a has already beeb answered as "beyond reproach"'

It is hard to guess at answers without the number of letters.
Presumably this is a general knowledge crossword. An ice house could therefore be an igloo. More information helps people to help you.

Thank you will give more details next time