Match the words in part A with part B. What materials are considered to be the principle pipe materials?

A. битумный материал, золото, сталь, бетон, серебро, асбестоцемент, ковкий чугун, известняк, древесина, чугун, плотноспекшаяся глина, кирпич, железобетон, гравий, медь, пластмасса, песок, камень

B. silver, asphaltic fiber, steel, wrought iron, brick, asbestos-cement, limestone, cast iron, gravel, concrete, vitrified clay, reinforced concrete, gold, rock, plastics, copper, wood, sand

Match the words with their synonyms.

1) full 9) occur a) weight i) operation

2) scarce 10) functioning b) empty j) happen

3) opportunity 11) interconnection c) deficient k) joint

4) load 12) permit d) demand l) clean

5) requirement 13) inspection e) chance m) desirable

6) satisfy 14) accurate f) transform n) meet

7) convert 15) preferable g) examination o) allow

8) damp 16) pure h) stop p) correct

Find the opposites of the following words in the text.

plentiful - … internal - … inexpensive - …

often - … imprecise - … maximize - …