1)Though simple electric and magnetic phenomena ………… since ancient times, most basic laws of electricity were discovered between 1784 and 1831. a) was known; b) have been known; c) have known
2) After the text about the advantages of electricity………… the students went on reading about the application and consumption of electricity.
a) had read; b) had been read; c) has been read
3) We………… the resistance in each case before we begin to carry out the experiment.
calculate; b) will have calculated; c) will calculate
4) During the autumn of 1831 M. Faraday established the scientific foundation from which our electrical age ………….
a) has developed; b) has been developed; c) developed
5) He assumed that for many years the only practical electric invention made by B. Franklin …………. the lightning-rod.
a) had been; b) has been; c) was
6) In 1825 Sturgeon …………. the first electromagnet, the device in which magnetism was generated by an electric current.
a) exhibited; b) was exhibited; c) had exhibited
7) They claimed that the battery was one of those devices that………… more than once.
a) has been invented; b) had invented; c) had been invented
8) Scientists believe that by the end of the 21-st century the whole mankind…………with the new kinds of energy.
a) will be provided; b) will have been provided; c) will have provided
9) Electricity has provided mankind with the most efficient source of energy. No other source of energy………… so widely used as electricity.
a) have been; b) was; c) has been
10) M. Faraday discovered electromagnetic induction which led to the development of the electric dynamo and motor. He ………… lots of experiments before he published the results.
a) has made; b) made; c) had made
1. He has been to many countries, he had many adventures.
2. he discovered the magic power of words.
3. Tiny is smaller than little.
4. Will you manage to do this job?
5. The story plot was complicated and children didn't understand it.
6. Many kids in our class are avid readers.
7. Mary had a charming smile.
8. Evil witch put a spell on the young prince, but her spell disappeared when the princess kissed him.
9 Jimmy gave a chocolate candy to his little sister and she immediately stuffed it in her mouth.
10 I lost my agenda (or diary) somewhere. My friends and I are looking everywhere for it.
11. Moscow University building looks very impressive.
12. When Nina said that penguins live in the North Pole, everyone in the classroom stared at her with wide eyes.
13. What an amazing child! He reads a book a day, he simply "consumes" books.
14. What is in this bottle?
15. Milk has been sitting on the table since morning, I think I has gone bad.