请选择正确的词语填入短文中。

A. example   B. counting   C. ancient    D. mix    E. kings

    Mike and Clare live in Cairo in Egypt because their father works there. They have visited many places in Egypt. For , they have seen the Pyramids, and they have visited the . palaces of the and queens of Egypt. Mike and Clare have learnt a little Arabic, and when they speak it, they often  it with German, French and Chinese. Recently, their father's company has asked him to go back to the US. Mike and Clare are  down the days.