A survey of mobile phone use was conducted ________

1.
A) to
B) of
C) by
D) from
the National Telecommunications Institute. They discovered that only five percent of people have downloaded a mobile phone game. The study found that many were confused about whether their handset could play games or how to download them. 2,500 phone users were ________

2.
A) interviewed
B) interview
C) interviews
D) interviewing
across the U.S. and several European countries.