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.

Comprehension:
People make plastic products by mixing the plastic with additives. The additives (1) ______ it difficult to recycle the plastic. To recycle plastic things, (2) ______ grind them up first, but this new (3) ______ is not easy to use again. A laboratory in California made a new type (4) ______ plastic to deal with this problem. (5) ______ scientists put the new plastic in a highacid solution, the plastic and the additives break apart. People can then easily reuse the plastic.