Can you please check if the following sentences are possible? Thank you.

1) Dr Kemp was writing at his desk when he heard a noise. He opened a window and looked towards the town.
2) An hour later he had finished his work. It was time for bed. He walked to the kitchen to get some water. As he was crossing the hall, he saw a dark spot on the floor.
3) He looked down and examined it carefully. It touched, looked and felt like blood. It was wet. He walked to his bedroom but the door was open though he had closed it earlier.
4) There was blood on it. He walked into his bedroom. There was a pool of blood on his bed. Then he heard a noise. It sounded like a voice. It asked him for help.
5) Kemp examined the blood on his bed. He saw a bandage hanging in the air. It was moving. It was covered in blood and it was empty. 6)The Voice said it was invisible. Dr Kemp replied that it was the Invisible Man.

Everything reads fine except that some of the instances of "it" don't have a clear antecedent.

http://www.ccc.commnet.edu/sensen/part2/thirteen/index.html

Sure, I can check if the sentences are possible.

1) "Dr Kemp was writing at his desk when he heard a noise. He opened a window and looked towards the town."

This sentence is possible. It describes an action taking place: Dr Kemp was writing, heard a noise, and then opened a window to look towards the town.

2) "An hour later he had finished his work. It was time for bed. He walked to the kitchen to get some water. As he was crossing the hall, he saw a dark spot on the floor."

This sentence is also possible. It provides a sequence of events: Dr Kemp finished his work, walked to the kitchen for water, and noticed a dark spot on the floor while crossing the hall.

3) "He looked down and examined it carefully. It touched, looked and felt like blood. It was wet. He walked to his bedroom but the door was open though he had closed it earlier."

This sentence is possible, but there is a slight error. Instead of "It touched," it would be more grammatically correct to say "It looked." The rest of the sentence is fine. It describes the actions of Dr Kemp examining the dark spot and noticing it resembled blood. He then walked to his bedroom but found the door open, even though he had closed it earlier.

4) "There was blood on it. He walked into his bedroom. There was a pool of blood on his bed. Then he heard a noise. It sounded like a voice. It asked him for help."

This sentence is possible. It describes Dr Kemp's observations of blood on something, then entering his bedroom to find a pool of blood on his bed. He then hears a noise resembling a voice, asking for help.

5) "Kemp examined the blood on his bed. He saw a bandage hanging in the air. It was moving. It was covered in blood and it was empty."

This sentence is also possible. It describes Kemp examining the blood on the bed, noticing a bandage hanging in the air that is moving and covered in blood, and realizing it is empty.

6) "The Voice said it was invisible. Dr Kemp replied that it was the Invisible Man."

This sentence is possible. It presents a conversation between the Voice and Dr Kemp, where the Voice states it is invisible and Dr Kemp responds that it must be the Invisible Man.