Which positon of "then" is correct and suitable?<ol><br/><li>Peter puts the vegetables into his lorry. <b><u>Then</u></b> he takes them to the market for sale.</li><br/><li>Peter puts the vegetables into his lorry.He <u><b>then</b></u> takes them to the market for sale.</li><br/><li>Peter puts the vegetables into his lorry. He takes them to the market for sale <u><b>then</b></u> .</li></ol>