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1. Most species of (1) pigeons (2) live in flocks, and many of the flocks (3) consist more than one (4) species.
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2. Everyone has (1) occasionally (2) sleepless nights, usually (3) associated with states of emotional arousal such as worry, anxiety, (4) or excitement.
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3. When petroleum (1) is processed into (2) plastic, it is no longer biodegradable, and (3) in which can clog up (4) landflils indefinitely.
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4. If (1) a (2) hydrogen-filled balloon is brought (3) near a flame, (4) it exploded.
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5. The (1) sisters' mother (2) bought (3) her two new dresses (4) each.
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6. The (1) living room was (2) enough large (3) to accommodate two long sofas (4) easily.
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7. (1) Increased contraceptive use (2) caused a decline (3) on the number of abortions (4) performed worldwide from 1995 to 2003.
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8. Today, the enemy is (1) within a radicalism that, (2) like Frankenstein’s monster, (3) have turned on its (4) former patron.
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9. She wears a black baseball cap (1) reads SECURITY and a (2) bulletproof vest but travels (3) unarmed, partly (4) for liability reasons.
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10. (1) Alike other mineral grains, (2) those in basalt are so small (3) that they cannot be seen with the (4) naked eye.
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11. A motorcycle racing gang (1) is suspected of involvement (2) of two attacks which left one man (3) dead and four others (4) injured.
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12. As temperatures which are (1) dramatic rising (2) melt the (3) polar ice cap, five countries race (4) to map their claims to a new energy frontier.
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13. Hard-line tactics (1) pursuing by the (2) military in its bid (3) to pacify the restless region are having (4) precisely the opposite effects.
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14. Politicians talked (1) more loudly but did much (2) fewer; they declared missions (3) accomplished although they had (4) barely begun.
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15. Many (1) importances products and (2) developments (3) have come from (4) research.
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16. The majority (1) of the people of Britain (2) has no confidence (3) in an expensive and fearless bureaucracy (4) like the European Union.
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17. China’s (1) spectacular transformation (2) over the past decade is (3) symbolized in (4) it’s architecture.
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18. Modern art began in (1) second half of (2) the 1800s, (3) after the camera (4) was invented.
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19. Jen finished her meal (1) quickly and (2) raised from the table, (3) showing her anger to everyone (4) present at the party.
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20. A firefighter has just crawled (1) across the (2) smoke-filled attic, trying to open a window for (3) ventilating, but no one (4) can find him now.
