Match the words with their opposites.

1) reduce 6) watertightness a) permeability f) strength

2) outside 7) savings b) expenses g) poor

3) sufficient 8) hollow c) strong h) intensify

4) neglect 9) weakness d) solid i) inside

5) weak 10) relieve e) appreciate j) extend

Make nouns from the following words.

Model: to cover → a cover

to divert →…to neglect →… to strengthen →…

to attach →… to found →… to simplify →…

to relieve →… to rely →… to permit →…

Fill in the correct prepositions then choose any five items and make sentences.

1) to transmit smth … smth; 2) to be … right angle … the axis; 3) to rest …smth; 4) to vary … height of dam; 5) to be filled … smth; 6) to be adapted … wide valleys; 7) to range … smth …smth; 8) to be designed … the same manner; 9) to take … account; 10) to slide … the dam; 11) increase … capacity; 12) to be placed … lifts …12 ft.