139. A middle school ESL teacher will be co-teaching a sheltered English immersion (SEI) mathematics class to expanding- and bridging-level English language learners. To determine whether each student has mastered a target mathematics concept and is ready to receive instruction in a new concept, the teachers plan to administer the weekly assessments provided in the grade-level mathematics textbook. Which of the following steps would be most appropriate for the ESL teacher to take to ensure the assessments achieve this goal?