1.  "I'll come with you as soon as I am ready", she replied.

She replied (that) she would come with me as soon as she was ready.

2.  "It isn't so sunny today as it was yesterday", Sandra remarked.

Sandra remarked (that) it was not (wasn't) so sunny that day as it had been the day before.

3.   "Will you be here for the next twenty minutes?", she said.
      "Yes", I answered.

She asked (me) if I would be there for the next twenty minutes and I said that I would. 

4.  "Don't take your coat off. We are going out again in a few minutes", he told her.

He told her not to take her coat off as they were going out again in a few minutes. 

5.  "Guys, put the message into a bottle and throw it into the sea", said the captain.

The captain told them to put the message into a bottle and throw it into the sea.