7.a-the
8.the
9.a-a-a-a
10.Ø
11.the-the
12.Ø
13.a-a-the-the
14.the
15.Ø
Bài 4:
1.the heaviest->Ø heaviest
2.old->the old
3.the->Ø
4.the most->Ø most
5.Alps->the Alps
6.the gossip->Ø gossip
7.Netherlands->the Netherlands
8.the very important->a very important
9.a->the
10.the->a