1.we________ ________ ________layers of ash almost six metres thick，which suggests that they________ ________ ________the fire burning all winter.
我们一直在挖掘一层层的积灰，几乎有六米厚。这意味着他们可能整个冬天都在烧火。
2．our evidence suggests that they________wear clothes made from animal skins.
我们的证据表明，他们确实穿着用动物皮制成的衣服。
3．________ ________it could be just like last year!
要是能跟去年那样有多好呀！
4．it ________ to have been made of bone.
这似乎是用骨头做的。
5．how about beginning with the alphabet?
我们从字母表开始怎么样？
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