Choose the correct item.

25 Ulan joined the clean-up day because/for

he cares about the environment.

26 It was so/such cold yesterday that the

water pipes in the house froze.

27 As/For they were working, they couldn’t

join us for dinner.

28 She has such/so a lot of money that she

can give lots to charity.

29 Since/So they were late for class, they had

to stay back at school.

30 The sea has such/so much pollution that

it’s not safe to swim in it.

Marks ____​