New research（研究) about how much time people spend on their smartphones(智能手机) per day.

People cannot use the smartphones to _________________

A．read e-books

B．send text messages

C．take photos

D．play football

Smartphone owner spends most of the time _______________ every day.

A．surfing on the internet	B．listening to music
C．watching videos	D．making phone calls

Making phone calls with the smartphone was only the _____ most popular use.

A．first

B．sixth

C．twelfth

D．fifth