The idiom “sitting on the fence” means to avoid saying which side of an argument you support or undecided.

E.g. :- You can't sit on the fence any longer - you have to decide whose side you're on.

The underlined part needs to be improved.

The error here is of incorrect usage of auxiliary verb.

• With singular subject, we need singular verb.
• Here, the subject is ‘the country’, which is singular, so singular auxiliary verb ‘is’ is required here.

• Thus, 'is now a cultural' is the most suitable one.

The correct sentence should be :- The country is now a cultural and social mosaic due to the influx of several different ethnic groups.

The underlined part needs to be improved.

• The error here lies in the incorrect usage of phrasal verb.

• The correct one is ‘end up’ which means to finally be in a particular place or situation.
  • E.g. :- They're travelling across Europe by train and are planning to end up in Moscow.
• Here, also, it is mentioned that the complaints will go in vain if someone try any other approach.
• Thus, 'complaints end up' is the most suitable one.

The correct sentence should be :- If you try any other approach, your complaints end up in the wastepaper basket.

• Sentences beginning with there or here follow a different order: the subject comes after the verb.
  e.g. There is the bus!
  
  The subject in this sentence is bus. Both bus and is are singular, so they agree.
   
• The noun 'evidence' is an uncountable noun. 
  
  e.g. The defendant was released after the prosecutor failed to produce enough evidence against him.
   
• We always use singular verbs with uncountable nouns. 
• Thus, we can easily eliminate options A and B. 
   
• The sentence is in the simple present tense (use of ......that links the suspect to the crime). 
   
• Thus, we will use the verb 'is'.

Let us understand the meaning of the given words :-

Attract = to draw by appealing to the emotions or senses, by stimulating interest, or by exciting admiration; allure; invite.

E.g.:- A campaign to attract more visitors to Shetland.

Fascinate = to have someone's complete interest and attention.

E.g. :- Science has always fascinated me.

Prevent = to stop something from happening or someone from doing something.

Disgust = a strong feeling of dislike for something that has a very unpleasant appearance, taste, smell, etc.

Release = to allow (a person or animal) to leave a jail, cage, prison, etc.

Let's understand the meaning of the given words :-

Resolve= to find an acceptable solution to a problem.

E.g.:- We need toresolveour internal disputes for betterment of our country.

Decide= to think carefully from available options and choose any one of them.

Refuse= to say that one is not willing to what he/she has been asked to do.

E.g.:- The managerrefusedto accept the idea put forward by us.

Analyse= to examine something for better understanding.

Agree= to have same opinion.

Illusory = based on illusion; not real.

Ephemeral = lasting for a very short time.

Endless = having or seeming to have no end or limit.

Infinite = limitless or endless in space, extent, or size; impossible to measure or calculate.

The sentence is grammatically incorrect and the error lies in Option C. The error is related topreposition.

• When "through" is used with a time expression, it refers to "continuing in time towards completion of a process or period".

• For example: The goal came midway through the second half. It means the goal was scored in the middle of the second half.

• In this sentence, a certain time period of "four years" is referred. "Through" does not refer to a certain time period.

• In such cases we use “over” to refer period of time from start to finish when a number is specified.

• For example: Over the past few weeks, I have been thinking much about my exams.

• Therefore, replace “through” with “over” to make the sentence grammatically correct.

has the correctly spelt word. Arefrigeratoris an essential home appliance for all seasons. It is used to store your perishable food items such as milk, butter, bread, fresh fruits, etc.

Let's understand the meaning of the given words :-

Augment = to increase the amount/value/size of something.

E.g.:- People are eager to augment their income through various sources.

Multiply = to increase the amount of something.

Amplify = to increase something in strength or sound.

E.g.:- The neighbours refused to amplify the dispute over car parking.

Decrease = to become smaller in size or number.

Increase = to make something greater in amount.