Answer: Option C. -> were having
Answer: (c)When the subject is in plural form (“they” in this case), the verb must also be in plural form. Therefore, “has had” is replaced by “were having”

Answer: Option B. -> the English language
Answer: (b)

Answer: Option C. -> the higher
Answer: (c)

Answer: Option A. -> be doing
Answer: (a)For an interrogative sentence with “would” , the subject is followed by be + present participle of the verb. Therefore “doing” is replaced by “be doing”.

Answer: Option B. -> are going to submit
Answer: (b)
Option (b) correctly replaces the phrase in bold. Other options are widely deviated and distorted.

Answer: Option D. -> After studying
Answer: (d)
The given sentence suggests that she returned to India to manage her family business after completing studies. Hence, the correct word is after not 'during' or 'while'.
Therefore, options (a) and (c) are ruled out. Option (b) splits the given sentence into two parts hence rejected. On close observation, we find that option (d) is correct in all respect.

Answer: Option B. -> don’t enter
Answer: (b)
The given sentence is a negative sentence as also it is giving a prohibitive command. As the given sentence is written in Indirect Speech, option (b) cannot be correct. Option (c) fits in place of the bold part correctly.
Therefore, we should go with it. Option (a) is apparently absurd.

Answer: Option A. -> why he was looking so depressed
Answer: (a)
The given sentence is ‘assertive’ not an ‘interrogative’ one. In an assertive sentence, the auxiliary verb comes after the subject, whereas in an interrogative sentence the auxiliary verb comes just after the question word. For example: Why were you absent from the class? – Interrogative Sentence
Why he was absent, asked his friend. – Assertive Sentence
In the light of the above examples, the given sentence is an assertive sentence. Therefore, option (a) is the correct option to replace the phrase in bold. All other options can easily be excluded by applying the principle of least deviation.

Answer: Option A. -> the poorer of
Answer: (a)

Answer: Option A. -> for improving
Answer: (a) ‘With a view to’ is a phrase. We must not confuse that after ‘to’ it should be V. Here ‘to’ has not been used as infinitive, rather it is a part of phrase ‘with a view to’. Therefore, after ‘with a view to’, the verb will take its V4 form. Hence replace ‘to improve’ with ‘to improving’.