Question

______ old lady is my mother.​

Answer 1

Answer:

An

Explanation

Because beside vovels we use only an

Answer 2

This/That

The word "this" has been used to depict that the speaker's mother is standing near, and is being denoted to. While the word "that" has been used to depict that the speaker's mother is standing a little far away, and is being mentioned in a conversation.

'This' and 'That' are actually demonstrative pronouns, which are used in indicating something in the sentence.