Zad 1
1. —
2. a
3. the
4. —
5. —, the, —
6. —, the, —
7. the
8. —
Zad 2
1. have to
2. had to
3. have to
4. had to
5. have to
6. has to
7. have to
8. will have to
Zad 3
1. Don't open the door!
2. John wasn't very tired last night.
3. Michael doesn't collect stamps.
4. We didn't spend last summer in Turkey.
5. He hasn't been here for a few months.
6. Don't help him
7. There aren't any birds on the tree.