a)
The sentences that are true are: 1, 2 and 5 
c)
- Work, gambling, shopping, technology 
- 3.5 billion
- Around $140 billion
- Getting to the top levels of a game, equipment you can win or buy within a game
- A nine-year-old boy who got up early and stayed up late to play Fortnite, and who spent his parents' money on the game
- A technology addict keeps going even if they know it's causing problems, and an enthusiastic user knows when to stop
- Because in the modern world people can't realistically take a break from technology
- It can't give us a deep connection with other people, it can't replace face to face contact