1.

I have a brother and two sisters. I love my family. (Correct)

I have brother and two sisters. I love my a family. (Incorrect)
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2.
She has a cheese sandwich, an apple, and some milk for lunch. (Correct)

She has some cheese sandwich, a apple, and a milk for lunch. (Incorrect)
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3.
My house is in London. It has a living-room and two bedrooms. In the morning I study English, and in the afternoon I work in a store. (Correct)

My house is in a London. (Incorrect)

In the morning I study an English, and in the afternoon I work in store. (Incorrect)

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Key Vocabulary