—Peter is always careless.—Don't ________others; there is no perfect person.
The number of people invited ___fifty, but a number of them____ absent fordifferent reasons.
They were arguing _____each other _____ the cause of SARS.
-----Hello, come in. . -----Thank you.
A group of soldiers went into the woods _______ the missing pilot.
Was it on that morning ________ you left for Beijing ______ he discovered our secret?