This story comes from my English book, The first sentence is given and I continue the story in (in my own words, etc.).

Emma could not believe what she saw when she opened the door and s went outside. She couldn’t imagine what had happened. The street was strangly quiet and calm ­—no cars, no birds, no people. She could hear only her own heartbeat. ‘It’s strange,’, she thought.

She walked for a few minutes and she didn’t see anything. ‘Where is everybody?’ she thought.
She shouted her parents’ name;, she shouted a lot of things, but she could only hear the echo of her voice.
She knocked at (you can say either ‘knocked at the doors’ or ‘knocked on doors’) doors of many houses but no one answered. As she was walking, she thought that perhaps she was alone in the world. ‘It’s madness!’ she thought.

Suddenly she saw a man running across the street and she started to run too. ‘Wait! Wait!’ she shouted to him, but the man didn’t stop. A few minutes later, the man had disappeared but Emma continued running.

The dark night was coming when she arrived at the cliffs. By then she was feeling nervousand desperate. Suddenly, she felt something behind her. She turned around and the man was there…

Su cuento es cierto a ‘clliffhanger’!

A STRANGE STORY Strange Story

This story comes is an exercise in writing [The book did not write this story] from given in my English book. The first sentence is given and I continue the rest.  the story in the way that I think..

Emma could not believe what she saw in front of her.  [I think this must be the original sentence.  You should not change the form or what so ever in this sort of exercise].  When she opened the door and she went outside, she couldn’t imagine believe what was happening. The street was in a strangely quiet, strangely [try not to use the same word] an eerie calm, with no cars, no birds, nor anyone aroundnobody. She could only hear her heartbeat.

"It’s Strange..."’, she thought.

She walked during for a few minutes and she but didn’t see anything.

"Where is everyonesomebody?" she thought.

She shouted for her parents’ names. She shouted a lot of many things and but all she could only heard was only the echo of her voice.

She knocked at on doors but none answered. of many houses and nobody opened it. While  She was continued walking.  she thought that perhaps A most dreadful thought came crashing into her mind [Should express in a different way.  This is creative writing after all.  This is not some kind of a report] - She was alone in the world!

"It’s a Pure madness!" She thought. [No need for all these explicitness.  She's alone after all.  So it is all understood.  The previous sentence implies all this while, this was going in her head]

Suddenly, she saw a man who was running across the street and she started to running too.

"Wait! Wait!" [Use double quotes instead] 

She shouted to him, but the man didn’t stop. A few minutes later, the man had he disappeared but Emma continued/kept on/ running.

The dark night was coming approaching/falling when she arrived at the cliffs. then She was feeling nervous. [Use short sentences to convey excitement] She was feeling desperate. Suddenly, she felt something behind her. She turned around. and The man stood before her! was there…

Very good storyline!  

A STRANGE STORY

This story comes from my English book. The first sentence is given and I continue the story in the way that I think it should go..

Emma could not believe what she saw in front of her when she opened the door and she went outside, she couldn’t imagine what was happening. The street was in a strangely quiet, strangely calm, no cars, no birds, nobody. She could only hear her own heartbeat.  ‘It’s strange’, she thought.

She walked during for a few minutes and she didn’t see anything.  ‘Where is everybody?’ she thought.
She shouted her parents’ names, she shouted a lot of things and she could only hear the echo of her own voice.
She knocked at the doors of many houses and nobody opened them. it. While she was walking, she thought that perhaps she was alone in the world.  ‘It’s a madness!’ she thought.

Suddenly, she saw a man who was running across the street and she started to run too. ‘Wait! Wait!’ She shouted to him, but the man didn’t stop. A few minutes later, the man had disappeared but Emma continued running.

The dark night was coming when she arrived at the cliffs.  By then she was feeling nervous, she was feeling desperate. Suddenly, she felt something behind her.  She turned around and the man was there…

Very good. Jeff is correct about double quotes for English orthography. I think he made too many changes to the original. (Jeff:  of course, that a is question of style and taste.)