Which of the following sentences is correct?

Reggie often says that appeals from charitable contributions make him depressed over the plight of unfortunate people. However, Reggie has never given even a dime to charity.

What does the second sentence do in relation to the first?

Sentence improvement.
The most remarkable article we remember ever to have read, challenging the orthodox belief system.

Find incorrect word/ phrase

You need both fine brown sugar as well as powdered sugar to bake a Hawaiian cake.

Which of the following is correctly spelt?

Paint is ___________ used to protect wood.

The accident not only_his leg but also_his joints