Complete the text with the correct form of the verbs in brackets and fill in the gaps with for or since.
Tropical rainforest have been an important life force on Earth ........ the beginning of time, They.......... (help) to keep the air we breathe fresh and clean.... milions of years.... the last fifty years, however, we..... (cause) a lot of damage by cutting them down for indrustial purposes.
Deforestation (the technical name for cutting down the rainforestes)......... (be) a problem.... the middle od the nineteenth centuy, ehen the industial revolution .............(start). The problem..... (grow) more and mnore quickly ...then, and..... the last two decades, we .... (reduce) our rainforest at the rate of about 1000,000 square kilometers every year.
Tropical rainforest have been an important life force on Earth ........ the beginning of time, They.......... (help) to keep the air we breathe fresh and clean.... milions of years.... the last fifty years, however, we..... (cause) a lot of damage by cutting them down for indrustial purposes.
Deforestation (the technical name for cutting down the rainforestes)......... (be) a problem.... the middle od the nineteenth centuy, ehen the industial revolution .............(start). The problem..... (grow) more and mnore quickly ...then, and..... the last two decades, we .... (reduce) our rainforest at the rate of about 1000,000 square kilometers every year.
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