Daniel helps Emma make phone calls. They have few tools in the lab. Daniel gives step-by-step advice.
Vocabulary:
Dial tone: The sound you hear when a phone is ready to make a call
Backup: A spare or extra item used if the main one fails
Line: The wire or connection used for phone calls
Charged: Having enough power in a battery
Step: A single action in a process
Practice more with this lesson:
