Articles : a, an, no article

There is ____orange book on the desk.

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There are ___ orange books on the desk.

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• no article

There is ___ book on the desk.

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• an

• no article

Is there ___ pencil case on the sofa?

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Are there ___ pencil cases on the sofa?

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• no article

Is there ___ amber pencil case on the sofa?

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• no article

Look! There's ___ cool bike over there.

Look! There's ___ really ugly bike over there.

There is __ ugly bike in the garden.

Look! There are __ many ugly bikes over there.