A sentence/ a part of sentence is underlined. Four alternatives are given to the underlined part which will improve the meaning of the sentence. Choose the correct alternatives. In case no improvement needed, click the option corresponding to 'No improvement'.
The environment provides us with life-sustaining resources, and it is essential preserve and protect it.
1
essential to preserve
2
essential preserving
3
essential preserved
4
essential will be preserved
5
No improvement