person; someone; human beings; mankind; human (Homo sapiens); (other) people; others
inside; within; while (e.g. one is young); during; among; amongst; in (secret, chaos, poverty, etc.)
regret; repentance; remorse
to have been decided (so) that; to have been arranged (so) that
putting out the light; switching off the light
laws of nature; physical laws; physics
signal; signalling; signaling; traffic light; traffic signal
learning; scholarship; study; study of ...; -ology; -ics
structure; construction; makeup; framework; organization; pattern
to be wide-ranging; to be diverse; to cover a lot of ground; to cover various topics
to add; to add up; to increase; to gather (e.g. speed); to include; to count in
to go to; to proceed to; to leave for
altitude; height; elevation; high-degree; high-grade; advanced
cultivation; refinement; culture; education
sleepy; drowsy; somnolent
study; diligence; discount; reduction
the place for; the time for; the level of
memorization; memorisation; learning by heart
item; heading; category; headword (in a dictionary, encyclopedia, etc.); entry
application problem; exercises
to untie; to unfasten; to unsew; to unstitch; to solve; to work out; to dispel (misunderstanding, etc.)
to memorize; to memorise; to learn; to pick up; to feel; to think
unable to compete with; not able to make a dent in (e.g. a problem); not able to get a solid hit in (e.g. in a fight); hard to chew
review (of learned material); revision
going to bed; retiring (for the night)
room light; interior light
to sleep like a log; to sleep like a baby
to lose (something); to mislay; to get rid of; to eliminate; to remove
how long; how far; how much
to sleep (lying down); to go to bed; to lie in bed; to lie down; to sleep (with someone, i.e. have intercourse); to lie flat (e.g. of hair); to lie idle (of funds, stock, etc.)
to wake up; to sober up; to come to one's senses; to become enlightened