A17:
1There is no evidence to show that ABC doesn’t order additional trucks.
2We cannot imply that higher paid for trash collection services indicate a better services in collecting rabbish.
3Maybe when we choose ABC .There is more respondents satisfied with ABC.
4Whether the respondents represent the residents all of his city.
A18:
1The condition in P is not similar to B.
2May be the regulation do not carry out for a long time, the obvious effect does not generate yet.
3Other factors contribute to the accidents.
4The measures taken 5 years ago cannot represent it dose same valuable effects today.
5The report accidents in B do not indicate the whole country’s rate of accidents last year.
A19:
1It is unwarranted that the conclusion one year ago is equal to today.
2May other alternatives contribute to great sale.
3The author fails to estanblish the causal relationship between Ad Libs compaign and M success.
4The manager’s claim that this success can be repeated elsewhere though fuplicating the M ad compaign might be unwarranted.