Question

already, state and federal governments have poured hundreds of millions of dollars into control measures, including electric barriers, harvesting programs, and even campaigns at home cooks attempt to seal off the carps potential passage into the great lakes with this level of investment. there really is no other project probably in the history of humankind, that has put so much time, money and effort into trying to curb the movement of an invasive species, says jim garvey, a professor of zoology and director of the center for fisheries, aquaculture and aquatic sciences at southern illinois university. the uss struggle against invasive carp has started with a well - meaning blunder, as journalist dan egan writes in the death and life of the great lakes. in the 1970s, government scientists in arkansas were testing to see if carp imported from asia could, as an alternative to chemicals, clean up algae from catfish farms and sewage lagoons. eventually funding ran out, and the research stopped. but some of the experimental fish were released, finding their way into the surrounding waterways. the scientists thought the fish wouldnt breed in the wild. they were wrong. as theyve migrated up the mississippi river basin, two species having a particularly suffocating effect. silver and bighead carp can live for decades, by eating pounds of plankton every day. studies have found silver carp make up more than 90% of the aquatic biomass in sections of the mississippi. in 2002, as part of a broader congressional effort to control invasive aquatic species, the army corps installed its first electric barrier to fend off non - native fish in the chicago ship and sanitary canal, the critical connection point between the mississippi basin and the great lakes. in a section of the canal in romeoville, illinois, about 10 miles upriver from brandon road, an underwater carpet of electrodes emits an electrical field designed to deter carp that swim near it. over the past two decades, the corps has spent about $286 million adding similar barriers in romeoville and tweaking their voltage levels. 7. which choice makes the sentence most grammatically acceptable? a. no change b. will leap c. leap d. leaped 8. which choice makes the sentence most grammatically acceptable? a. no change b. measures including electric barriers c. measures included electric barriers, d. measures, including electric barriers, 9. which choice makes the sentence most grammatically acceptable? a. no change b. that had c. had d. has 10. which choice makes the sentence most grammatically acceptable? a. no change b. started c. had started d. starts

Explanation:

1. The context suggests a general - truth or habitual action, so the simple present tense "leap" is correct.
2. "Measures, including electric barriers," is the correct non - restrictive appositive structure.
3. The past perfect tense "that had" is incorrect as there is no need to show a past - before - past relationship. "No Change" is correct.
4. The action started in the past and is still relevant, so the present perfect tense "has started" (original "No Change") is appropriate.

Answer:

1. c. leap
2. d. measures, including electric barriers,
3. a. No Change
4. a. No Change