3. Present Perfect or Present Perfect Continuous? 1. Someone (eat) … all the cakes. I‟ll have to buy some more.
2. What (you buy) … your sister for her birthday?
3. My throat is really sore. I (sing) … all evening.
4. Brenda (learn) …. Russian, but she finds it difficult.
5. How many people (you invite) …. to your party?
6. Those two for cats (sit) … on that branch for the last party?
7. It (rain) … all day! Why can‟t it stop?
8. Diana (wear) …. twelve different dresses in the park week!
9. I (do) … everything you asked. What should I do now?
10. Graham and Pauline (try) … to find a house for ages, but they can‟t find one they can afford.
Насчет проблемы не знаю даже,поищи сама в русском варианте,а потом просто переведи на английский и запиши :)
One more significant plus of them is a opportunity to deeper scientific researches. Scientists use special technologies to study controversial questions, the answers to which will be useful for the mankind.
to sum up, there are many advantages of new technologies that make our life more interesting and comfortable.