Question

(1) Use 'not only ... but also in the following sentence:
UNESCO and the International Council on Monuments and Sites
initiated a draft convention to create an international organization
responsible for protecting cultural heritage.
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Answer 1

not only UNESCO but also International Council on Monuments and Sites initiated a draft convention to create an international organization responsible for protecting cultural heritage.

it may help....

Answer 2

Question:

Use 'not only ... but also in the following sentence:

UNESCO and the International Council on Monuments and Sites initiated a draft convention to create an international organization responsible for protecting cultural heritage.

✿Answer:

Not only UNESCO but also the International Council on Monuments and Sites initiated a draft convention to create an international organization responsible for protecting cultural heritage.