'The clock has struck five.' is a complete sentence and hence 'none of se' is correct answer.

Board did not ask this question in previous exam.

As 'children' is a plural noun next word used should be in singular form. like is correct option

Statement 'A' is a question, so sentence for blank must be in an interrogative form. Statement 'B', answer to question in 'A', is in present continuous tense and so question must also be present continuous. 'B' tells us current action of subject 'she'. Thus, sentence to be used in 'A' must be a question that asks about current activity of subject 'she'.
Option A is incorrect. Although sentence is an interrogative form and also asks about activity of subject, it is not in present continuous tense. In or words, it does not ask about current activity of subject.
Option B is incorrect. It is an incomplete phrase as it lacks a main verb and also it is not in present continuous tense.
Option C is correct. It is an interrogative phrase in present continuous tense. Also, it is asking about current activity of subject. Thus, it meets all required conditions.
Option D is incorrect. Although 'She is doing' is in present continuous tense, it is not an interrogative phrase, so, cannot be used to ask a question.

'Patrolling' means to keep watch over (an area) by regularly walking or travelling around it. Hence, option C is correct answer.

The adjective like superior is normally used with to. "Superior than" would refore form a wrong sentence. Option B is correct.

A perfect participle phrase indicates an action that occurred in past. It is used to modify main verb in main clause.
Examples: Having being fired from job, she started looking for a new job.
Having paid banned in most cities, movie did not do well.

None of options is correct. The correct sentence is 'I feel feverish'.

In this sentence, correct preposition to use after verb "laugh" is "at." When we laugh at someone or something, it implies that we find m amusing or ridiculous. Therefore, correct sentence is:
Please, don’t laugh at those beggars.