1. Her excessively demure attitude has been an obstacle to her social life.
2. Even vague rumours that the super market would sell small amounts of rice used to create mayhem among housewives many years ago when it was scarce.
Even vague rumours that the supermarket would sell small amounts of rice when it was scarce used to create mayhem among housewives many years ago.
3. Repairs to the shrine augmented its value as historical architecture.
'Restoration works' would be better.
4. A magnificent plan to publish an encyclopaedia encompassing all the plants in the world ended in a mockery.
5. I have never been in a drunken stupor.
6. Whoever makes friends with him will get more patient because he is incoherent.
His speech is incoherent or he speaks incoherently.
- except that nothing ends in a mockery; something is a mockery, and something that is a mockery can 'end in farce' (if it gets worse). The word 'mockery' can also collocate with 'make' - 'make a mockery of <something>'