The _____ of lectures could be enhanced by introducing the lecture with a brief review of the work _____, it should also be indicated how the day's lecture _____ into the course pattern. A lecture should _____ be presented in one unbroken discourse. Unless exceptionally interesting, a long lecture strains the _____ of a concentrated listening, causing intermittent wandering of attention and loss of continuity in though
with a brief review of the work _____, it should also be indicated