advertising mail sent by non-households to other households) is not known and, thus, it has not been added to advertising mail.
The advertising mail is unknown and has not been added to the rest of the advertising mail.
The advertising mail has all been added to advertising mail.
Is there anything that can be done in case, as we believe, the predictions of calamity turn out to be true?
Taxes are entirely irrelevant.
The man is outdoors.
The health effects of NO2 and SO2 are unquantified.
A man is using his legs.
I thought it was all too hard to understand.