Creating a quiz can be time-consuming and you might have a black-out when it comes to creating sentences. One great free online resource is Tatoeba. Tatoeba is a collection of sentences and translations.
You can search for any word you want to find sentences for. I also find the tags quite useful. Here are some example tags that will help you to find sentences quickly by a topic:
PS: To quickly create a gap in Learnclick, you don’t need to click on the button “Create Gap” after selecting the text. You can use the keyboard shortcut Ctrl+G (Windows) / Cmd+G (Mac)