1. John isn't in. He (has gone) to the pictures again although he (has been there) twice already this week. 2. They (have not spoken) to each other since they quarrelled. 3. That grandfather's clock (has been standing) there for as long remember. 4. Cyril (has been trying) to take me out to dinner for the last three 5. How long have you (been learning) English? 6. I (have been waiting) here nearly half an hour for Maisie;do you think she (has forgotten) to come? 7. My clothes (have been hanging) in the wardrobe all the time I was away, and now I see the moths (have eaten) great holes in them. 8. My watch (has been going) for three days and it (has not run down) yet. 9. He (has lost) his books.He (has been looking) for them all the afternoon, but they (have not turnd up) yet. 10. Have you ever (seen) a live rhinoceros? You have just (been looking) at the picture of one I shot in Africa last year. 11. Jack (has gone) to Switzerland for a holiday, I have never (been) there. 12. He has only (written) to me once since he went away, I send him four letters. 13. She (has read) all the works of Dickens and Scott. How many have you (read)? 14. I (have been sitting) for my portrait for the last six months, but the artist (has not finished) yet. 15. You must wake her! She (has been sleeping) soundly for ten hoers!
1. Modern optical devices give (pres simp - to give) our scientists an opportunity to look into the mystery of the microstructure. 2. The researchers conducted (past simp - to conduct) their experiments in the tropics. 3. Scientists will be (fut simp - to be) able to predict what effects deforestation will have (fut simp - to have) on the climate and air quality. 4. The use of the laser in biological and medical applications is rapidly expanding (pres cont - to expand) . 5. Tomorrow we’ll be discussing (fut cont - to discuss) the alternatives to natural protein. 1. Современные оптические устройства дают нашим ученым возможность заглянуть в тайну микроструктуры. 2. Исследователи провели эксперименты в тропиках. 3. Ученые смогут предсказать, к каким последствиям приведет обезлесение на качество климата и воздуха. 4. Использование лазера в биологических и медицинских приложениях быстро расширяется. 5. Завтра мы обсудим альтернативы натуральному белку.
1. medicinal
2.
3. pollution
4. stressful