1. The experiment was prepared by the laboratory assistant by seven p.m. yesterday.
2. Our life has been changed greatly with the appearance of electricity.
3. The exams were passed by the students by last Tuesday.
4. By next week our tests will have been examined by the teacher.
1. have liked
2. was
3. bought
4. have you known
5. have known
6. did you get
7. have been; got
Mary has neither brothers nor sister.
There are many nice buildings in Moscow
This theatre is in the centre of the city
There are many interesting articles here
There are few girls in this class
The magazine is on that chair
There are no magazines on that chair
She usually has lunch at(Present Simple)