The correct passive of: `Who can do it`?
By whom can it be do?
By whom can it be did?
By whom can it be done?
By whom could it be done?
Explanation:
Correct Answer is: By whom can it be done?

By whom can it be do?
By whom can it be did?
By whom can it be done?
By whom could it be done?
Correct Answer is: By whom can it be done?

Mr. Qureshi is a university Professor. Here `university` is a- Option A: Noun , Option B: Determiner , Option C: Noun adjective, Option D: Pronominal adjective, correct answer is: Noun adjective
Go and catch the falling star. Here the “falling” is- Option A: an adverb , Option B: a preposition , Option C: an adjective, Option D: a verb, correct answer is: an adjective
Let the task ___ done as directed. Option A: is , Option B: to be , Option C: was, Option D: be, correct answer is: be
There has been a breakthrough in the treatment of dengue. Here `breakthrough` is a/an: Option A: adjective , Option B: verb , Option C: noun, Option D: adverb, correct answer is: noun
I prefer tea - milk. Option A: than , Option B: then , Option C: to, Option D: more, correct answer is: to