单项选择题 One expert (remarks) that a computer with (so) many tubes as the brain (has) neurons (would require) the Empire State Building to contain it.

单项选择题 You (will) almost always (find) Caroline (playing) a video game because she enjoys (to be challenged).

单项选择题 It is the interaction (between) people, (rather than) the events that occur in their lives that (are) the main focus (of) social psychology.