Your hubs are actually very nice. (I especially like the one about German phrases.) But you might want to add a little more depth to them by including polls, news feeds, YouTube videos and/or a table here and there that compares one aspect of a topic against the other. All of those will make your hubs more engaging.
This hub has some other suggestions for increasing both the content and income-producing ability of your hubs: https://hubpages.com/community/make-money-writing-