Itamar Tzadok

To the extent that you want to search by the entry's time created or modified, afaict, not possible within the standard activity. You can search outside the activity by generating logs report but with the standard reports the data may not meet your requirements. If the week or month are in entry fields, you can use the advance search of the activity for searching by these fields. hth

The cloze shortanswer is a naive but good enough example.

The dog smelled a smelly thing.

Smelly things:

• A cat.
• A dog.
• A car.

The dog smelled a {1:SHORTANSWER:%100%cat#~%100%dog#~%100%car#}.

Variables work for non-numeric answers just as well.

The dog smelled a smelly thing. 

Smelly things:

• A cat.
• A dog.
• A car.

"The dog smelled a cat" and "the dog smelled a dog" are both correct answers in the question's context. "The dog smelled a chair" is not a correct answer in the question's context.

I'll try to port the field type and will let you know how it goes. Shouldn't be too difficult though because the dataform field merely renders an img tag and PaintWeb js does the rest.

You can try the Dataform module. You can create a form with various fields, add an entry for each student such that each student can view only his/her own entry but cannot edit it, and the teacher can view and edit all entries. Students can access the feedback from the activity link on the course page. You can also display the feedback in a Dataform view block on the course page or on my moodle page. hth