When I woke up, it was already midnight and it took a few seconds for my eyes to _____ to the darkness.

The noise _______ by the machine could be heard at night． 

Mary's birthday ________ on a Sunday this year.   

A good teacher must _____ to his students the importance of a proper learning method．

It is nice to see millions who had nothing but a record of misery and hungry ______ to improve their life and living conditions．