Tell your brother to come _____, because it's going to rain in a minute or two.
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?
—Someone has tidied the sitting room! —Jim __ it this morning; he couldn't bear the mess any more.