Initially, commercially available films only lasted about 30 seconds because the fierce jerking movement of the feed mechanism tended to break filmstrips when they were more than fifty to one hundred feet. ___

When an audience is so varied that it is impossible to adapt to

every member, a speaker may focus on key audience members. Key audience members are people who a. sit in the front row. b. appear to be the most encouraging. c. have influence or ability to make things happen. d. are friends with the speaker. e. the best dressed.

______ are an element of culture referring to verbal and nonverbal language.

Fill in the blank(s) with the appropriate word(s).