Раскройте скобки и поставьте глагол в нужном времени и залоге; переведите предложения на русский язык:
1) Russian scientists (to make) many important discoveries last century.
2) Their laboratory (to visit) just by a group of American doctors.
3) When I (to cross) the street I (to meet) my friend.
4) Many new books by Russian writes (to translate) into English every year.
5) Ann (to send) just two letters to her parents.
6) A new specialist (to send) to the chemical laboratory next month.
7) Our lectures (to begin) at 9 o’clock.
8) My friend (to graduate from) the Institute this year.
9) They (to show) already a new film.
10) Don’t open the window. It (to rain) hard.
11) They (to finish their experiment by 10 o’clock.
12) The workers (to build) a new stadium by the end of last month.