Children need friends ______ their own age to play with. 

Due to the widespread ____ of advanced technology, the price of computers has come down greatly.

Tom’s little sister is a girl of great _______. She takes an interest in everything.

--- Mum, I’m going to visit my aunt. What about a week? --- A week is too long. Try to be back in a ______ of days. 

These companies succeeded because they were the first companies to make use of the ____________ of the internet and was thought highly of by some experts.