Teste dein English
Broughton

Teacher's Resource Pack 4/5
Seer, Angelika; Zekl, Claudia

The Heinemann English Grammar

Muret- Sanders English - German
Langenscheidt's

Conserving Rainforests
Banks, Martin

English in Mind 1 Workbook 1
Puchta, Herbert ua

Pollution
James, Barbara

Business and Commerce
Wood, Neil

Basic English Usage
Swan, Michael

Lexikon der englischen Synonyme