【推荐1】印加的建筑工人将石头切割成精确的尺寸，仅仅凭着石头间的完美契合，即可稳固墙体。
Inca builders cut stones to exact sizes so that nothing was needed to hold walls together________ ________ the perfect fit of the stones.

【推荐2】这个合同只能由你自己签。
The contract cannot be signed by anyone___________ ___________yourself.

【推荐1】由于驯鹿不断迁徙，萨米人会收起帐篷，跟随而去。
Since reindeer were always________, the Sami would pick up their tents and accompany them.

【推荐2】People were ______ ______ —and then, later that afternoon, another big earthquake hit the city again. (处于震惊状态) (根据汉语提示完成句子)