scientists have _________ a method of recycling the contaminated oil.

we did not realize the ___________ of the problem.

without that ambulance the target set out in the patient charter would not be _______.

she tried in vain to _____ to him the unfairness of the situation.

the owner is making huge profits at the expense ______ downtrodden peasants.

if the factory workers have met their quotas for the week, they can __________ early on friday afternoon.

we ________ a discussion with them about the differences between britain and the us.

you should not use any personal electronic __________, such as a cell phone, while driving.

the police were certainly ________ off the mark in reaching the scene of the accident.

this material absorbs the sound, and doesn't ________ it.

sometimes happiness is just a matter of attitude _______.