Premise:
"Audit reports should state that the audit was made in accordance with generally accepted government auditing standards."
Hypothesis: The audits have specific rules to which they must adhere.

it is not possible to tell

Premise:
"The nuns in the convent here preserve their seclusion; visitors must have special permission to enter."
Hypothesis: The nuns residing in the convent do not interact with the visitors.

it is not possible to tell

Premise:
"Cityus also travels to Guangzhou from CHKC; there are five round-trips a day, taking 31/2 hours."
Hypothesis: Each round-trip from CHKC to Guangzhou takes about an hour.
no