If we had not been ______ by the traffic jam, we would have arrived an hour earlier.
There used to be a mountain in our village, at the top of which ________.
It was along the Mississippi River ________ Mark Twain spent much of his childhood.
Linda,make sure the tables ________ before the guests arrive.
________caused the accident is still a complete mystery.
—May I borrow your computer? —Sorry, it is ________ at the moment.