Human beings spend a lot of time trying to figure out what will make them happy, but not nearly enough time trying to （ ）the happiness they already have.
Nuclear wastes are considered to （ ）a threat to human health and marine life.
Last night he saw two dark （ ）center the building, and then there was the explosion.
The text and dialogue below (A) focus on (B) cultural differences between Chinese and Western societies which (C) can create misunderstanding if ignoring (D).
The boy spends most of his time in English（ ）passing the examination this year.
The text and dialogue below (A) focus on (B) cultural differences between Chinese and Western societies which (C) can create misunderstanding if ignoring (D).
