Questions

The Lake is located in the Andes mountains near Bolivia-Peru border at a height of 3810 m. It is also the largest lake in South America.

Since, the starting statement carries a subject; S will be the first statement as it talked about the world’s fastest computers. The next statement describes the initial use of the same and the statement that follows states the new uses of the computers as environmental tools. Thus SQRP is the correct sequence and thus form a coherent paragraph.

The correct formation would be, ‘The world’s fastest computers initially conceived for military purposes are finding various new uses as environmental tools.

The meanings of the given words are as follows:
Histrionic: excessively theatrical or dramatic in character or style
Melodramatic: characteristic of melodrama, especially in being exaggerated or overemotional
Theatrical: exaggerated and excessively dramatic
Conscientious: wishing to do one's work or duty well and thoroughly
Diligent: having or showing care and conscientiousness in one's work or duties
Tenacious: tending to keep a firm hold of something; clinging or adhering closely
Retentive: (of a person's memory) effective in retaining facts and impressions
Thrive: (of a child, animal, or plant) grow or develop well or vigorously
Tussle: a vigorous struggle or scuffle, typically in order to obtain or achieve something
Pertinent: relevant or applicable to a
particular matter; apposite Appropriate: suitable or proper in the circumstances
Therefore, it can be observed that option  i.e. ‘melodramatic, theatrical’ forms a synonym- synonym pair of ‘histrionic’.

Something that saves your money is cost-effective and is also called as economical.

CTRL + ] is a computer shortcut and is used for Increase in font size.

Shortcuts :

Re-do ---- Ctrl + Y

Right align text ---- Ctrl + R

Expand or collapse the ribbon ---- Ctrl + F1

Ctrl + F is a shorcut keyword and it is used for searching the word you want in the large document in the M.S. Word.