Es, esta
Ser describes what she is, a secretary.
Estar tells where she is, in the office.
Answer:
3) 492 cuatrocientos noventa y dos
4) 529 quinientos veintinueve
5) 711 setecientos once
6) 988 novecientos ochenta y ocho
7) 1868 mil ochocientos sesenta y ocho
I hope this helps you!!
What in the world is that
Yesterday I went to the library and took out a ______ and a ______