Rewrite the Hindi sentences by changing the gender of the subject.

Here are the solutions to the Hindi grammar questions:

Question (bullet point):
Original sentence: "अच्छा आदमी देखता है।" (A good man sees.)
The task is to change the gender of the sentence.
The original sentence has a masculine subject ("आदमी" - man), masculine adjective ("अच्छा" - good), and masculine verb ("देखता है" - sees).
To change it to feminine, "आदमी" becomes "औरत" (woman), "अच्छा" becomes "अच्छी" (good, feminine), and "देखता है" becomes "देखती है" (sees, feminine).

Comparing with the options:
A) "अच्छा औरत देखता है।" - Incorrect (adjective and verb are masculine).
B) "अच्छा औरत देखती है।" - Incorrect (adjective is masculine).
C) "अच्छी औरत देखती है।" - Correct (adjective and verb are feminine).
D) "अच्छी औरत देखती हैं।" - Incorrect (verb is plural, but "औरत" is singular).

The correct option is C.
$\boxed{\text{C}}$

Question 1:
Original sentence: "वह हर परीक्षा में प्रथम आती थी।" (She used to come first in every exam.)
The task is to change the gender of the sentence.
The original sentence has a feminine subject implied by the verb ("आती थी" - used to come, feminine past).
To change it to masculine, the verb "आती थी" becomes "आता था" (used to come, masculine past). The pronoun "वह" remains the same but refers to a male.

Comparing with the options:
A) "वे हर परीक्षा में प्रथम आती थी।" - Incorrect (subject changed to plural "वे" and verb is still feminine).
B) "वह हर परीक्षा में प्रथम आता थी।" - Incorrect (verb ending "थी" is feminine, should be masculine "था").
C) "वह हर परीक्षा में प्रथम आता था।" - Correct (verb is masculine past).
D) "वह हर परीक्षा में प्रथम आती था।" - Incorrect (verb "आती" is feminine, but "था" is masculine, creating a mismatch).

The correct option is C.
$\boxed{\text{C}}$