Visitors ________ take an animal or any other item prohibited by the Expo Bureau to the Expo Park.
On foggy days, you have to drive very ________ on the expressway to avoid traffic accidents.
One thousand dollars a month is not a fortune but would help cover my living.
—Mary broke up with me! —You_ _have forgotten about the Valentine's Day.
Have you considered how weak humans area volcano, hurricane or earthquake?
Can you explain ________ the sun goes down in the west?