Level: Basic. Focus: Essential prepositions in common English idioms. Exactly 12 questions, 3 options each. Exactly 2 questions have two correct options.

Level C1. Topic: advanced epistemic vs. deontic modals. Exactly 12 multiple-choice gap-fill questions, 3 options each. Exactly 2 questions have two correct options.

Level C2. Topic: hedging, inference, and degrees of certainty in academic prose. Exactly two items have two correct answers.