1, D – slow
2, B – there
3, D – bear
4, B – pollutants
5, A – animals
6, B – were
7, B – would
8, B – got
9, A – the day before
10, C – be widened
11, D – should
12, D – carnivores: animals that eat meat (động vật ăn thịt)
13, D – rich crops (bumper – adj, bội thu)
14, C – rich >< poor
15, A – bettering >< worsening
16, D – I’d love to
17, B – Every day except Sunday.
