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Answer:
1. At the review mirror.
2. Blind spots.
3. Signal.
Explanation:
When driving an automobile and a driver decided to have a lane change, he or she must understand and do three things always. These things are the following:
1. When a lane change must be made, look AT THE REVIEW MIRROR.
2. Glance behind to check BLIND SPOTS.
3. Always SIGNAL lane changes.