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21. In recent years ______ global warming is becoming _______concern for people all over the world.
A. the; the B. /; a C. /; / D. the; /
22. Though working in a famous company and having a big income, he only ______ his wife $200 a year for clothes.
21. In recent years ______ global warming is becoming _______concern for people all over the world.
A. the; the B. /; a C. /; / D. the; /
22. Though working in a famous company and having a big income, he only ______ his wife $200 a year for clothes.

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