完成句子：

小题1: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。

We have been excavating layers of ash almost six metres thick, which suggests that they ①_____ _____ _____ the fire burning all winter.

小题2:看样子他们用磨尖的石器来切割野兽并剥皮。

It seems that they used the ②_____  ______  _______ to cut up animals and remove the skin.

小题3:十几岁的时候， 他就开始探求人生的深层意义。

As a teenager, he ③______  _______  ______ a deeper meaning in life.

小题4:每次试图破纪录的时候，Ashrita 都会达到一个体力不可逾越的极限点。

Every time Ashrita tries to break a record, he ④______ _____ ______ ______ he feels he cannot physically do any more.

小题5:她看到母亲和大一些的孩子在烧烤鹿肉和猪肉。

She could see her mother and the older children preparing the deer and pig meat ⑤_______  _______  _________.

密封型放射源使用完后，三个月内必须送具有资质的单位进行处理。