Fill in the blanks with appropriate words by choosing the suitable set of answers from the options given below in the paragraph.

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 thought.