Choose the sentence that uses the preposition incorrectly:

The kite is flying on the sky.

The correct answer is Option (3) → The kite is flying on the sky. 

Option 3: The kite is flying on the sky. Incorrect.We use the preposition "in" for the sky because it is treated as a three-dimensional space or volume that contains objects. The preposition "on" is used for surfaces (like a table or a wall). Correction: The kite is flying in the sky.

Option (1): Read the poem on page 50. This is correct. The preposition “on” is properly used with page numbers.

Option 2: I live on street 10.  Correct. It is standard to use "on" when referring to the name or number of a street (whereas "at" is used if you provide the specific house number).

Option 4: Put on your new clothes.Correct. "Put on" is a phrasal verb meaning to dress oneself.