Question: Sixtysix Free English online dictionary based on WordNet 30
Please fix the punctuation.
Fixed: [Sixty-six - Free English online dictionary based on WordNet 3.0]

Question: However some manufacturers give some coupon to get some special discounts
Please fix the punctuation.
Fixed: [However, some manufacturers give some coupon to get some special discounts.]

Question: What should you do to get them back
Please fix the punctuation.
Fixed: [What should you do to get them back?]

Question: Some of the prominent causes are listed below
Please fix the punctuation.
Fixed:
[Some of the prominent causes are listed below:]