Choose the correct words.
The beach is dirty so / because everybody
leaves rubbish on it.
1 It's bad to bury plastic so / because it
doesn't decompose.
2 He was unhappy about the problem, so /
because he wrote a letter to the council.
3 I've got a shopping bag, so / because I don't
need to use plastic bags.
4 We're worried about plastic bags so /
because they're bad for the environment.
5 I feel cheerful today so / because it's my
birthday
6 They were very hungry, so / because they
ate a packet of biscuits.​