中学生世界九年级英语沪教版54制
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One day when I came home, Shadow didn't show up to greet me. I soon learnt that Shadow was sick.
Since
it was suffering from heart failure, we took it to the animal clinic immediately.
Then one day, the vet called us that Shadow had passed away. On hearing the news, I cried my heart out.
No other pet has ever been able to
replace
my beloved Shadow since then.
答案：5. Since
解析：根据语境“因为它患有心脏病，我们立刻带它去了动物诊所”，since表示“因为，既然”，所以填Since。
6. replace
解析：根据语境“没有其他宠物能取代我心爱的Shadow”，replace意为“取代”，be able to后接动词原形，所以填replace。
