Answer:
1. B. had / would have helped
2. C. If I had been
Explanation:
Mant times you just add "ly" to the word, like these examples: careful becomes carefully, quick becomes quickly.
You didn't write any sentence. Sorry
Answer:
"Biodegradable” refers to the ability of things to get disintegrated (decomposed) by the action of micro-organisms such as bacteria or fungi biological (with or without oxygen) while getting assimilated into the natural environment."