Please correct the error recognition

In the next following sentences, each sentence has four words or phrases underlined. You are to identify the one underlined word or phrase that should be corrected or rewritten.

1. Although Congressional representatives and senators may serve an unlimited number of term, the president is limited to two, for a total of eight years.
2. The first electric lamp had two carbon rods from which vapor servesto conduct the current across the gap.
3. thunderhead, dense clouds that rise high into the sky in huge columns, produce hail, rain, or snow.
4. Although no country has exactly the same folk music like that of any other, it is significant that similar songs exist among widely separated people
5. Despite of the Taft-Hartley Act which forbids unfair union practices, some unions such as the air traffic controllers have voted to strike even though this action might endanger the national security.
6. Operant conditioning involves rewarding or punishing certain behave to reinforce or extinguish its occurrence.
7. There is an unresolved controversy as to whom isthe real author of the Elizabethan plays commonly credited to William Shakespeare.
8. A catalytic agent suchplatinum may be used so that the chemical reaction advances more rapidly.
9. When a patient’s blood pressure is muchhigher than it should be, a doctor usually insists that he will not smoke
10. It was the invent of the hand-held electronic calculator that provided the original technology for the present generation of small but powerful computers.
11. Located in the cranial cavity in the skull, the brain is the larger mass of nerve tissue in the human body.
12. Alike other forms of energy, natural gas may be used to heat homes, cook food, and even run automobiles.
13. An organ is a group of tissues capable to perform some special functions, as for example, the heart, the liver, or the lungs.
14. Insulin it isused to teat diabetes and is secured chiefly from the pancreas of cattle and hogs.
15. In autumn, brilliant yellow, orange, and red leaves are commonly to both the Sweet Gum tree and the Maple.
16. A swarm of locusts is responsible the consumption of enough plant material to feed a million and a half people
17. Oyster farming has been practice in mostparts of the world for many years
18. It was Shirley Temple Black whichrepresented her country in the United Nations and later became an ambassador
19. The prices at chain stores are as reasonable, if not more reasonable, as those at discount stores
20. Historicallythere has been only two major factions in the Republican Party – the liberals and the conservatives
21. Whitman wrote Leaves of Grass as a tribute to the Civil War soldiers who had laid on the battlefields and whom he had seenwhile serving as an army nurse.
22. The Chinesewere the first and large ethnic group to work on the construction of the transcontinental railroad system.
23. The range of plant life on a mountainside is a resultsof differences in temperature and precipitation at varyingaltitudes.
24. The more the relative humidity reading rises, the worst the heat affect us
25. Because correlations are causes, statistical data which are extremely easy to misuse.
26. Despite ofmany attempts to introduce a universal language, notably Esperano and Idiom Neutral, the effort has met with very little success.
27. As every other nation, the United States used to define its unit of currency, the dollar, in terms of the gold standard.
28. John Dewey thought that children will learn betterthough participating in experiences rather than through listening tolecture
29. Some methods to prevent soil erosion are plowing parallel with the slopes of hills, to plant trees on unproductable land, and rotating crops.
30. Neither my mother nor my sister are happy about the situation

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