Question

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Answer 1

You keep the same subject for example in number 1 the subject is dancer so you would start the sentence with "the dancer" then you would add the verbs which are slides and leaps so your sentence would be "The dancer slides and leaps."

Answer 2

So you're going to make the sentences shorter and more compact.

The dancer slides. The dancer leaps.

You need to change it by adding an "and" 

So now the sentence will be like this: The dancer slides and leaps.

And you'll do the same thing for each sentence. Hope this helps x)