One of the major__ loadshedding.

Many a man _______ tried to complete the work.

The principal and secretary (be) present in the meeting.

There are four underlined sections in the text. Which one is correct.
Although non-renewable resources eventually returns to the earth after we have used them, they do so in different forms and are dispersed, and so it is often difficult to gather them for use again. Mercury is an example of an uncommon metal that are used in industrial processes, and in agriculture to kill fungi.

Which of the following sentence is correct?

Sweet ________ the uses of adversity.

Identify the incorrect sentence.