Indefinite pronouns. Grade7

Have you read ... by Oscar Wilde?

I haven't heard from her for a month.I am afraid ... has happened to her.

... could do this work. It's very simple.

Could you give me ... to eat?

I have ... to add.

Can ... answer my question?

The test was very difficult. ... could do it.

He is Mr Know-All. He can tell you about ... .

Is there ... here who speaks English?

I don't know ... about it.

... knows Madonna. She is very popular.

She didn't say ... because she thought she was being treated unfairly.

I am not going ... this summer.

Where is my pen? I can see it ... .