In the following passages the numbered gaps indicate missing words. Against each number in the below each passage, five choices are offered in columns lettered A to E. For each question choose the word that is the most suitable to fill the numbered gap in the passage.

Locusts have from time to time been the cause of terrible -71- of farms. -72- of locusts can, in a few hours, strip vast areas of green and fertile country of all signs of -73-. They are -74- or periodic -75-. After a heavy -76- of an area, they may not reappear for ten or fourteen years. Now that more is known of the life of locusts, there periodic -77- are better understood and consequently more -78-. Scientists now know the regions in which the gregarious phase of locusts may occur, and can even sometimes -79- when an -80- will take place. By modern methods of dusting and -81- the young locusts, such as the -82- can be destroyed on a large -83- before they do much -84-. The D.DT -85- has proved particularly effective.
The main source of -86- to the government is -87-, which can be direct. While the former is based on one's -88- the latter is imposed on goods and -89- and is paid only when these are -90-. Other sources include -91-, such as those paid by mining companies, and sale of -92- for dogs, guns, hotels e.t.c. Another major source is -93-, which is different from others because it has to be repaid. From these and other sources, government is able to raise -94- with which it carries out its -95- which include administration and the -96- of services.
Besides, it is able to control the country's -97- by imposing taxes sometimes to prevent -98- or by altering patterns of -99- through the raising of -100- against certain foreign products.

In question numbered 72 above, choose the best option from letters A - E that best completes the gap.

A. Swarms

B. Herds

C. Colonies

D. Flocks

E. Shoals

In question numbered 73 above, choose the best option from letters A - E that best completes the gap.

A. pasture

B. filed

C. vegetation

D. weed

E. life

In question numbered 74 above, choose the best option from letters A - E that best completes the gap.

A. parennial

B. casual

C. temporary

D. seasonal

E. occassional

In question numbered 75 above, choose the best option from letters A - E that best completes the gap.

A. parasites

B. bacterial

C. predators

D. vermin

E. pests

In question numbered 76 above, choose the best option from letters A - E that best completes the gap.

A. encounter

B. invasion

C. adventure

D. downpour

E. visit

In question numbered 77 above, choose the best option from letters A - E that best completes the gap.

A. attacks

B. ambushes

C. escapades

D. combats

E. skirmishes

In question numbered 78 above, choose the best option from letters A - E that best completes the gap.

A. curable

B. protective

C. controllable

D. preventable

E. destrucible

In question numbered 79 above, choose the best option from letters A - E that best completes the gap.

A. propose

B. declare

C. suggest

D. predict

E. announce

In question numbered 80 above, choose the best option from letters A - E that best completes the gap.

A. eruption

B. outburst

C. outrage

D. outbreak

E. incursion

In question numbered 81 above, choose the best option from letters A - E that best completes the gap.

A. wiping

B. pumping

C. disposal

D. draining

E. spraying