It was along the Mississippi River _________ Mark Twain spent much of his childhood.
Please excuse my __ in without __.
He can’t help __ housework, for he is busy __ for the examination.
________her mother had come, her face lit up.
The situation is more ________than ever. I'm ________about what to do next.
Linda can't attend the party________ at Tom's house at present because she is preparing a speech for the party ________ at Marie's house tomorrow.