Insert a, an, the or X

Ex8. Insert a, an or the OR X
1. I remarked that if there was ___________leak in ___________gaspipe there might be
___________explosion while he was reading ___________meter.
2. He said, 'As ___________matter of ___________fact, there was ___________explosion
in ___________last house I visited; and Mr Smith, ___________owner of
___________house, was burnt in ___________face.'
3. 'Mr Smith was holding ___________lighted match at ___________time of
___________explosion.'
4. To prevent ___________possible repetition of this accident, I lent him
___________torch.
5. He switched on ___________torch, read ___________meter and wrote
___________reading down on ___________Back of . . .envelope.