все Present and Past времена. 1) it's very difficult to ... children nowadays .(raise)
2)the changes in the earth's atmosphere ... many changes in the weather .(have caused)
3) they used some cold water to ... the patient ... (cause to regain consciousness)
4) Matthew ... his father to his way of thinking .(has persuaded )
5) the manager ... the subject of redundancy . ( raised)

Pros

Solving the food problem

Economical use of agricultural land

Obtaining plant medicines, plant vaccines

Plant resistance to viruses, diseases, pests, pollution

High yield of transgenic plants

Improving the quality of plant varieties

Minuses

The tests carried out are short-term, the effect may affect the offspring

Spontaneous transfer of foreign genes from transgenic to non-transgenic organisms

The emergence of resistance to insecticidal toxin

Damage to harmless insects

The development of allergic reactions

The possibility of mutations

1. The police found some fingerprints on the wall, didn't they?

2. Canterbury was a Roman town once, wasn't it?

3. There has been a lot of rain this spring, isn't there? (Конструкция с it будет выглядеть иначе, например: It has been a rainy spring, hasn't it?)

4. That didn’t seem a very important book, did it?

5. Jenny hadn’t arrived when we got to sleep, had she?

6. Nothing interesting happens this week, does it?

7. I’m not disturbing you with my presence, am I?

8. Your mum has been working in this factory for a long time, hasn't she?

9. Hens can fly for short distances, can't they?

10. You have never been to Sweden, have you?

Правило образования разделительных вопросов:

Если первая часть вопроса имеет утвердительную форму, то вторая часть — отрицательную. Вс глагол ставится в том времени, в котором стоит глагол-сказуемое.

Если же первая часть вопроса представляет собой отрицательное предложение, то вторая часть будет в утвердительной форме.