Answer:
Cross out used answers.
Step-by-step explanation:
When in a test you are being asked to match a question with its correct answer, you are (unless stated otherwise) expected to not match one answer with two or more questions, that is to say, each question should have one and only one matched answer. In order to avoid confusion, it is therefore advisable cross out used answers so that you donĀ“t come back to them and use them again.