9. Put the verbs in brackets into an appropriate tense In the last few years there (1) has been (be) a marked change in To our attitude towards environmental issues. It (2)_ (start) with Io scientists revealing that a hole (3) - (begin) to develop in the ozone a layer above the Arctic Circle; when people (4)- (start) to notice changes in the climate , it (5) (become) obvious that there (6) (be) a serious threat. Those of us who (7) lever/ use) an aerosol spray will presumably think twice before eusing one again. And what (8) happen to all that nuclear waste we have produced? Presumably most of it (9) - ( be/dump) into the sea , but the number of protesting voices (10)- (increase) steadily year by year.
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