In the very first 3 sentences each 'click' and 'click on' are ok, but why use the term 'on' when it is not necessary? Inside the 4th sentence 'click on listed here' sounds Unusual. Preferable is: "Click here ..". eager about the footwear, the size in the shoes (13), comparison https://sergiordpyj.bloguerosa.com/19746396/click-things-to-know-before-you-buy