Sani-Seat can offset the rising cost of paper products
Can we say the following?
The cost of paper is rising.

yes

Google and NASA announced a working agreement, Wednesday, that could result in the Internet giant building a complex of up to 1 million square feet on NASA-owned property, adjacent to Moffett Field, near Mountain View.
Can we say the following?
Google may build a campus on NASA property.

yes

Thanks to the thirty Heads who responded to my question about maternity leave. Clearly, the amount of maternity leave offered to teachers at international schools varies greatly from school to school.
Can we say the following?
Maternity leave varies in Europe.

no

After years of study, the Vatican's doctrinal congregation has sent church leaders a confidential document concluding that "sex-change" procedures do not change a person's gender in the eyes of the church.
Can we say the following?
Sex-change operations become more common.
no