1.I will conclude by saying… 最后我要说…
efore, we have the reason to believe that…因此，我们有理由相信…
things considered,总而言之 It may be safely said that…它可以有把握地说……
efore, in my opinion, it's more advisable…因此，在我看来，更可取的是…
what has been discussed above, we may safely draw the conclusion that…通过以上讨论，我们可以得出结论…
data/statistics/figures lead us to the conclusion that…通过数据我们得到的结论是，…
can be concluded from the discussion that…从中我们可以得出这样的结论
my point of view, it would be better if…在我看来……也许更好
