How do you say “just like you did” in german?

Teach some german. if anyone could teach me some german that would be great, i’m considering taking a german course and wanted to know some basics first. all is appreciated; )

Fill in the missing demonstrative article. ich kaufe pfred a. dieser b. diese c. dieses d. diesen

Choose a logical response: welcher tag ist heute? schreiben gern samstag laufen (dont answer if you aren't sure )