[Q]: Would the following sentence, by the strictest standards, be considered correct? Cohen proved the independence of the continuum hypothesis.
++++++++++
[A]: acceptable


[Q]: Would the following sentence, by the strictest standards, be considered correct? What we are using is their teaching material.
++++++++++
[A]: acceptable


[Q]: Would the following sentence, by the strictest standards, be considered correct? Mary not avoided Bill.
++++++++++
[A]:
unacceptable