They _______ have had advanced civilization.
must
must not
Their civilization disappeared. It ____________ rained enough to grow crops.
might not
might not have
Look at this bowl. They _________ used this serve food.
could of
have
You must have ________ a hundred photos today.
took
taken
Trish didn't come on the tour. She _______ have been sick. She wasn't feeling well.
couldn't
may
