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Are you running on the search network, search network partners and/or the content network (if running in the US)?

Are you targeting desktop?  Mobile?

Are split testing across ad groups?

Are you split testing ads within ad groups?  How many per ad group?

Is there a call to action in your ad?

Are you capitalizing the first letter of every word?

Are you using correct punctuation for every sentence (this can trip you up and make you sentences hard to read where a top ad looks different from a side ad)?

How many keywords are you using in each ad group?

Are the keywords tightly related in each ad group?

Are you using broad, broad match, phrase or exact match keywords?

Using Bing automation to raise/lower bids and/or enable/pause campaigns/keywords base on criteria you set?