24. Fill in the correct preposition, then choose any five items and make sentences.

1) to depend … sth.; 2) to show … in our supplies; 3) to be subdivided … sth.; 4) to be used … the control of water; 5) to require attention … sth.; 6) to point … sth.; 7) to deal … sth.; 8) water … rest and … motion.

25. Fill in the tables.

verb	noun
to control	a control
	utilization
to require
	protection
to navigate
	supply
to construct

verb	noun
to improve
	conservation
to manage
	dependence
to destruct
	design
	development

26. Translate the following words into English using the vocabulary of the text.

Использовать природные ресурсы; развитие водных ресурсов; проявляться в запасах воды; использование гидравлического сооружения; осушительные и оросительные системы; применение инженерных правил; инженерия по использованию водных ресурсов; паводковый контроль; дренаж и канализационные системы; улучшение навигации; управление экосистемой; предотвращать разрушение; указывать на развитие науки в будущем.

27. Read the following text and fill in the missed words.

a) quantity	g) needed	l) economic
b) accurately	h) power	m) tests
c) demands	i) create	n) chemical
d) provide	j) water-supply	o) methods
e) quality	k) acceptable	p) determine
f) water-resources engineer

The job of 1)________ may be limited by a number of basic questions associated basically with the 2) ________ and quality of water. The first question is: "How mush water is 3)________?" This is probably the most difficult of all design problems to answer 4)________, because it involves social, 5)________ and engineering aspects. Basically the answer depends on future 6)________ for irrigating crops, domestic water and hydro­electric 7)________.

Being adequate in quantity, water must often withstand cer­tain 8)________ of quality. Thus the second question is: "What is the 9)________ of water?" Problems of water quality are encountered in planning 10)________ and irrigation projects. Polluted streams 11)________ many problems. Therefore in order to 12)________ the amount and character of impurities in water it is necessary to employ 13)________ and bacteriological tests. The effect of these impurities on water quality - must be evaluated and set standards of 14)________ quality. The engineer must then 15)________ the necessary facilities for removing impurities from the water by mechanical, chemical or bacteriological 16)________.