Based on your search query, I would recommend using Twee for your lesson on Australian explorers.

Twee is an excellent tool for English teachers, designed to speed up lesson planning with quick content creation. It can help you produce a variety of content types, all related to the teaching topic at hand.

Here's how Twee can assist you:

• Quick Content Creation: You can create multiple choice questions, open questions, and true/false statements about Australian explorers in no time. This can help in assessing students' understanding of the topic.
• Dialogue and Story Generator: You can draft dialogues and stories about Australian explorers, making the lesson more engaging and interactive.
• Activity Ideas: Generate listening, speaking, reading, writing, and grammar exercises related to Australian explorers. This can help in reinforcing the topic and improving students' language skills.
• Vocabulary Builder: Generate vocabulary lists related to Australian explorers and design fill-in-the-gap and open-the-brackets exercises. This can help students learn new words and phrases related to the topic.
• Supplementary Material: Produce discussion questions, facts, and quotes from famous Australian explorers that are relevant to the lesson topic. This can stimulate class discussions and deepen students' understanding of the topic.

Currently, Twee offers free early access beta, making it a cost-effective solution for your needs.