She has a good command of English. (Improve)

• A. command in
• B. command on
• C. No improvement (Answer)
• D. command over

'Command of' a language is the correct expression. No improvement needed.

She is more clever than her sister. (Improve)

• A. cleverer than (Answer)
• B. most clever than
• C. cleverest than
• D. No improvement

One-syllable adjectives and some two-syllable ones form comparatives by adding -er. 'Cleverer' is preferred.

He made a great progress in his study. (Improve)

• A. a great progresses
• B. great progress (Answer)
• C. great progresses
• D. No improvement

'Progress' is uncountable — no article, no plural form.

She could not remember where had she kept the keys. (Improve)

• A. where she had kept (Answer)
• B. where did she keep
• C. where she kept
• D. No improvement

In embedded/indirect questions, use normal sentence word order (subject + verb), not inverted.

He has not wrote to me since January. (Improve)

• A. has not write
• B. has not written (Answer)
• C. had not written
• D. No improvement

The past participle of 'write' is 'written', not 'wrote'. 'Wrote' is simple past.

I am learning English from last year. (Improve)

• A. have been learning English since (Answer)
• B. learned English from
• C. have been learning English from
• D. No improvement

Present perfect continuous with 'since' is correct for ongoing actions from a past point.

The audience were asked to take their seat. (Improve)

• A. to take their seats (Answer)
• B. to take seat
• C. to take a seat
• D. No improvement

Since multiple audience members are seated, 'their seats' (plural) is correct.

He works very hardly. (Improve)

• A. very hard (Answer)
• B. hardily
• C. harder
• D. No improvement

'Hard' is both an adjective and adverb. 'Hardly' means 'scarcely/barely', not 'with great effort'.

She is the most talented of the two sisters. (Improve)

• A. more talented of (Answer)
• B. more talented than
• C. the most talented than
• D. No improvement

When comparing two, use comparative degree. 'Most talented of the two' is incorrect.

He passed with first division. (Improve)

• A. in first division
• B. No improvement (Answer)
• C. with the first division
• D. from first division

'Passed with first division' is an acceptable expression in Indian English. No improvement needed.