Which of the following is a run-on sentence?
a. tomas was frustrated during class he forgot his book report. b. the concert started and the music was incredible. c. they danced for hours; they never felt remotely tired. d. holidays always go by too quickly since i get those days off.

Choose the sentence that is not logically connected in the paragraph. (1) one final effect of radio and tv on the language must must be noted. (2) there is no doubt that these great media of information have cut down considerably the time that used to be devoted to reading. (3) radio and tv may enhance the spoken word. (4) they tend to lower comprehension levels.