1. Are your parents at home? - No, they have just gone away. 2.I haven't seen you for three years. What you did you do? - I worked as a secretary, have you shown your water-colours to anybody yet? 4. He is leaving for Paris next week. 5. I have never seen such a wonderful brooch. When did you buy it? 6. The lecture has already begun. You are a little late. 7. It is still raining, it has been raining since morning. 8. Your cheek is like a grater! Have you shaved today? 9. This guy studies at our university. I have seen him several times. 10. - Your hands are dirty, - I was repairing my car. 11. I can't go out because | haven't finished my work. 12. - What is Tom doing now? - He isn't doing anything. 13. He is always arguing with his dad! 14. - What are you thinking of now? - I am thinking of what you have just said. 15. - What are you doing tonight? - I haven't decided yet. 16. These flowers smell very sweet. 17, I can't believe my ears! They are getting married next month! 18. My sister always dreams to see Stonehenge. 19. You are packing your suit for 2 hours. Hurry up! Our train leaves at 4p.m. 20. I have just called him. He is still sleeping. He has been sleeping for 3 hours.
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