1.  To make it worse, the tenure system fails to resolve the inefficiency of the distribution of public goods.

2.  To sum, without comparing the benefits and harm the limit may bring about, the suggestion fails to convince everyone, and\

3.  To sum up, the conception of the editor fails to substantiate, for the evidences that have been cited in the passage don't lead strong support to what the editor has mentioned in the letter.

4.  To sum up, the author fails to convince me by his argument.

5.  To sum up, the vice president of the Climpson fails to substantiate his cliam that the company can have higher profit by implementing electronic monitoring, because the evidences cited in the analysis do not lend strong support to what he maintains.

6.  To sum up, the arguer fails to substantiate his claim that humans caused the extinction of the various mammal species through excessive hunting, because the evidences cited in the analysis do not lend strong support to what the arguer maintains.

7.  To sum up, the personnel director fails to substantiate his claim that taking the Easy Reading course can bring in benefits to the company, because the evidence cited in the analysis do not lend strong support to what he maintains.

8.  To sum up, this arguer fails to substantiate his recommendation that Climpson Industries should implement electronic monitoring of employees' Internet use from their workstations to improve their overall profits.

9.  To sum up, the author fails to convince me by his recommendation.

10.  To sum up, the arguer fails to certify his conclusion on the basis of these insufficient evidences.