_____no modern technology, the Egyptians had to move each stone by hand[ ]

Passengers will likely face the usual struggle to get their tickets during festivals, __________ at railway stations, where long lines are expected.

I think this is ______ useful book.

下列各句中，没有错别字且读音全对的一项是

______ with the size of the whole earth,the biggest ocean does not seem big at all.