Fill in the gaps in the sentences with the correct article - a, an, the or zero.

1.  Robert and Jessica went to _____ party last night.

• zero
• a
• the
• an

2. The Severn is _____ river.

• a
• the
• zero
• an

3.  Hania broke _____ glass when she was washing-up.

• a
• the
• zero
• an