The mere fact thatticket sales in recent years for screenplay-based movies have exceeded those for book-based movies is insufficient evidence to conclude that writing screenplays now provides greater financial opportunity for writers.

The fact thatthe nearby city has a weakening economy does not prove that (does not support the claim that/does not ensure that/lends no strong support to the conclusion that) the city will not contribute significantly to tax revenues.

The fact thatthe student performance improved after the application of interactive computer instruction does not necessarily imply that the new teaching method is responsible for the achievements.

The argument fails to rule out the possibility that a writer engage in both types of writing as well as other types.

The argument simply equatessuccess with movie ticket sales, which is unwarranted.

The author assumes thatphysical capabilities are the only attributes necessary to operate a motor vehicle.

The author provides no evidence that the realism of photography is the reason for its predominance.

This assumption presents a false dilemma, since the two media are not necessarily mutually exclusive alternatives.