Young as he is, David has gained ____ rich experience in ____ society.
Can you explain ______ that the medicine has for my illness?
--- I serve three meals every day and do almost everything for him, but he still lets me down. --- I’m afraid that’s ______ you are mistaken.
China’s winning the host of the Olympic was an exciting moment, ______ all Chinese will never forget.
Measures have been taken to prevent accidents, but much ______ for more improvement.
. As we all know, it was ______ that resulted in the terrible car accident.