Build up the correct words.

Model: amd → dam

1) ibremt → … 6) ahetr → … 11) ionditcon → …

2) ircb → … 7) erlifl → … 12) ledubar → …

3) elip → … 8) veridt → … 13) poryramet → …

4) twidh → … 9) tihegh → … 14) meaperble → …

5) stoc → … 10) urextim → … 15) damferofc → …

Find in the text the synonyms of the following words.

a) mixed - ... c) hermetic - ... e) action - ...

b) sufficient - ... d) solid - ... f) pervious - ...

Find in the text the opposites of the following words.

a) expensive - ... c) deep - ... e) high - ...

b) permanent - ... d) the worst - ... f) watertight - ...

Fill in the necessary preposition then choose any five items and make sentences.

1) to be made ___timber; 2) to use only ___ shallow water; 3) to be filled ___ rock; 4) a kind ___ cofferdam; 5) to vary ___ 10 ___ 40 years; 6) mixture ___ clay and sand; 7) to depend ___ conditions; 8) to wash out _____ the gaps; 9) to be low ___ cost; 10) to be used ___ cofferdams; 11) to be ___ watertight ___ possible; 12) because ___ the large base width; 13) to consist ___ circular sheet-pile cells; 14) to be necessary ___ an embankment ___ any kind.