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In less than 10 minutes (I think), the call came. I picked it up and she sounded surprisingly awake. I'd thought she would call me the moment she woke up. I could imagine she was changed and ready to head out. I was still too tired because I went to bed at 3 am, so I asked her to call me back later. As soon as I hung up, I drifted back to dreamland.

Please check for mistakes.
Thanks.
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In less than 10 minutes, I think, the call came. I answered it and she sounded surprisingly awake. I'd thought she would call me the moment she woke up. I imagined she had changed and was ready to head out. I was still too tired, because I went to bed at 3 am, so I asked her to call me back later. As soon as I hung up, I drifted back into dreamland.

You can't pick up a call, but you can answer it. You can pick up the phone/receiver.
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Thanks, MM. One question, Why is "she was change" not right?

Thanks.
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She was changed-- Not not right, just a little uncommon and too passive for the context, I thought.
Thanks, MM. I agree with you. I always love your recommendations to make writings more natural though they sometimes are really difficult to learn.
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