Reading
2 1) conventional 2) interact with 3) reaction 4) impregnated with 5) optimal concentrations 6) inner layer
Vocabulary
3 1) prevent 2) track 3) introduce 4) stay 5) cause 6) consume 7) control (The vertical word is protect.)
Grammar
4 1) can/may be kept 2) are made 3) was invented 4) to be used 5) has been found 6) are related
5 1) More goods are being produced in plastic.
2) A plastics recycling scheme has just been introduced by our local council.
3) Plastics are used in the manufacture of pills.
4) A new type of biodegradable plastic bottle is about to be launched.
5) The factory's glassmaking division might be shut down, to concentrate on plastic.
6) If plastic hadn't been invented, what materials would be being used today?
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