Question

She was staring angrily _ him

Answer 1

Answer:

she was staring angrily at him.

Answer 2

She was staring angrily at him

EXPLANATION:  

Prepositions are used as connectors that is used to connect nouns or pronouns with adjectives. The different prepositions are in, on , at ,for, of etc., ‘at’ is mostly used while specifying time. Example: We usually meet at 5’o clock. ‘at’ can also be used to specify places, action on a person, phrases etc., ‘I didn’t like the dance at all’ . ‘At first I thought you were his friend’. These are some of the examples where we can use ‘at’.