______ a short time the number of cells is more than a trillion.

there is a close _______ between the gills of a fish and the lungs of a mammal.

he was on the subway when he called and started to _________ before i could answer.

the ______ assumptions to be used in valuing the scheme will be chosen by the purchaser's actuaries.

my mom and my mother-in law are just _________ and oranges and should not be left alone in the same room for too long.

their ____ of these measures roused the people to indignation.

the ____ of this regulation gives us discretionary power.

the president has the authority to ______ orders to the military.

i was still working _____ and off as a waitress to support myself.

mr. Russell served ________ president of the association for fifteen years.

the oldest parts of the castle date _______ to 1560, and were built by king frederick ii, after whom the palace is nameD.