Simple: A kettle heats water., Hot air balloons can fly at great heights., Music helps people to sleep., Calculators are used in places like schools and offices., How does an alarm clock work?, Complex: Before adding sugar, mix the butter with a mixer., We all went to the doctor when my sister got sick., When the calculator turns on, the display always shows zero., People need a license to drive before they buy a car., After 6 o’clock , the radio channel plays relaxing music.,

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