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The sentence is in the passive voice, requiring the present perfect passive construction 'has been completed'.

The sentence refers to the rapid growth of population. Increase is the most standard and appropriate term to describe this demographic trend.

The phrasal verb set out is commonly used to mean to start a journey. Set in or set off do not fit the context of departing for a specific destination as well as set out.

 The correct form is "I am pleased..."

In a professional or business context, salaries are paid to staff. While disbursed is technically correct in finance, paid is the most natural fit for general staff salary contexts.

Put off is a phrasal verb meaning to postpone or delay. This fits the context of an exam being rescheduled due to a natural disaster.

The verb sound is a linking verb that requires an adjective to describe the subject. Happy is the correct adjective form.

The phrase nothing but is an idiom meaning only. It is the correct prepositional construction for this sentence.

Beside is a preposition meaning at the side of or next to. Besides means in addition to. The context clearly requires the location relative to the lake.

Placed is the most precise verb to describe putting an object in a specific location like a table. Kept is also possible but placed is more specific to the action of setting it down.

The phrasal verb deal in means to trade or do business in a specific commodity. Deal with means to handle a person or a situation.

Agree to is used when referring to a proposal, plan, or suggestion. Agree with is used when referring to a person or an opinion.

 Even is the most logical choice. we don't want to get killed by our enemies. Nor are we looking to be equal with them either. Generally we seek to 'get even' which means to seek revenge. 

This is a common proverb: Take care of the minutes, and the hours will take care of themselves. It emphasizes the importance of small units of time.