Direction : In the following passage some words have been deleted. Fill in the blanks with the help of the alternatives given. Select the most appropriate option for each blank.

PASSAGE People make plastic products by mixing the plastic with additives. The additives..........(87)............ it difficult to recycle the plastic. To recycle plastic things...........(88) .......... grind them up first, but this new.............(89)................ is not easy to use again. A laboratory in California made a new type..............(90)............. plastic to deal with this problem............(91) .............. Scientists put the new plastic in a high-acid solution, the plastic and the additives break apart. People can then easily reuse the plastic.   87.