2.It is possible that…

　　3.The argument fails to rule out the possibility that…as well as…

　　4.The argument simply equates…with…, which is unwarranted.

　　5.Common sense tells us that…

　　6.While this may be true in some cases, it is equally possible that…

　　7.One can infer from the survey’s results that…

　　8.Lacking more specific information about…, it is impossible to asses…to make an informed recommendation.

　　9.It is unlikely that…

　　10.If so, even though…, the author’s argument that…would be seriously weakened.

　　11.However, this is not necessarily the case.

　　12.Without knowing…, we cannot accept the author’s conclusion.

　　13.Consequently, unless the author can demonstrate that…, the author’s concern about these issues is unfounded.

　　14.But no evidence is provided to show that this explanation is correct.

　　15.In the first place, a great deal of empirical evidence shows that…

　　16.However, unless…,there is a good chance…17.The author unfairly trivializes…

　　18.Given that…, the prediction about…is still in lack of solid ground.

　　19.Comprehensive analysis is necessary to identify the actual cause(s) of…

　　20.The statistics offered…warrants only the conclusion that…

　　21.Therefore, any decision aimed at addressing the problem of…must be based on more thorough investigation to gather sufficient data insgroupsto narrow down and locate the actual cause(s) of the problem.

　　22.There is also the possibility that…

　　23.From the survey quoted in the argument, however, we find no sign of such procedures for random sampling, and have good reason to doubt if the sample is representative enough to reflect…

　　24.If this will be the case,…not necessarily mean…

　　25.Without further investigation any claims made about…are doubtful…