Dear source Your activity is very interesting and the grammar poit is one of the most important. However....
You page is not interactive and then canīt be (as it is ) considered as an ONLINE exercise. But it is not late to re-edit it to use the component provided by the online editor (such as interactive textboxes, list comboBoxes and so). Unless you didnīt save your work on the server before you publish it.
ONLINE exercise means that PP can interact with their computers to provide the answers to your questions and of course they are corrected and scored automatically as soon as they press the "OK" button.
Hope youīve saved your work. Canīt wait to see it as a real interactive ONLINE exercise.