Aplicația este accesibilă de pe ecrane late

Edison was working on telegraph and __________ technology.
A: vibrations
B: design
C: telephone
D: marks
He noticed that sound produced __________.
A: design
B: vibrations
C: assistant
D: marks
He believed that these movements could make __________.
A: hours
B: vibrations
C: marks
D: surface
The marks had to appear on a __________.
A: surface
B: paper
C: design
D: telephone
Edison drew a __________ of his new machine.
A: telephone
B: mark
C: assistant
D: design
He asked his __________ to build the model.
A: friend
B: team
C: assistant
D: mother
The assistant’s full name was John __________.
A: Kruds
B: Edison
C: Kruesi
D: Cruel
According to a popular story, the model was completed in about 30 __________.
A: minutes
B: months
C: days
D: hours