We hadn't practised question words yet, so if that was hard: we'll tackle it tomorrow.
Difficulty with the present simple? You can practise in SlimStampen, grammar 1b, or in Extra opdrachten (directly below SlimStampen)
Personal pronouns hard? Grammar 2b, or Extra opdrachten
Question words: Grammar 3a/3b and Extra opdrachten
Words: Slim Stampen or just study from your book.