Explanation

We use "on" for floors in a building (e.g., on the second floor).

So, "Her apartment is on the second floor" is correct.

Explanation

To motivate others to achieve certain goals is a function of leading.

Leaders inspire and guide individuals or teams toward achieving objectives.

Explanation

The boat moves from one side to the other side of the river, so "across" is used.

"Across the river" means crossing over the river.

Explanation

Explanation

Cotton is known as the "Silver Fibre" of Pakistan due to its economic importance and export value.

It plays a key role in Pakistan’s textile industry, the backbone of the country's economy.

Explanation

Inspection in education aims to coordinate, stimulate, and direct the professional growth of teachers.

It involves observing teaching practices and providing feedback for improvement and development.

Explanation

When comparing two people, we use "more beautiful" (comparative form of "beautiful").

"Most beautiful" is used when comparing more than two.

Explanation

We use "in" to show that someone lives inside a place like a castle.

So, "The princess lives in the castle" is the correct usage.

Explanation

"By" means next to or beside someone.

So, "My sister sat by my mom in the bus" is the correct sentence.

Explanation

"From" is used to show removal or separation (taking something away).

So, "I had to take my book from the table" is correct.