很高兴为你解答.
保证正确率~!
正确答案是：
1、我去蛋糕店拿一个在三天前就订购好的蛋糕
I went to the cake shop for the cake I had ordered three days ago.
2、我把蛋糕放在一个包装精美的盒子中,并在蛋糕的周围洒上花瓣
I put the cake into / in an exquisitly packed box and scattered some petals around it.
注意哦：exquisite 的第一个读音是元音,冠词用 an.
祝开心~!