单项选择题 The new tenant (in) the apartment was (obviously) both (suspicious) and interested (in) his neighbors.

单项选择题 The scientists, (concerned about) the potential hazards, demanded (the latest) research finding (made) (publicly).

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.