these new findings turn the accepted theories on their ________.

call your doctor if the symptoms ________ for more than three days.

the speaker gave an interesting _________ on urban transport.

improved funding is fundamental ________ the success of the project.

the position became ______ when rodman was promoteD.

although the afflicted creatures do not behave aggressively, fosco said, they still ______ a threat to domestic animals.

she said the government would ________ the necessary legislation to deal with the problem.

anyone caught ________ will be immediately disqualified from the exam.

look at your sister out there! She's as _______ as a clam at high tide now that she's back in the starting lineup again.

it's difficult to _____ the difference between butterflies and moths.

she rejected the charge that the story was _______.