a. employed
b. were employed
c. have been employed

2. Four people to the conference yesterday.
a. were invited
b. invited
c. are invited

3. Many accidents by dangerous chemicals.
a. caused
b. are caused
c. will have been caused

4. Our plan by the members of the committee now.
a. was discussed
b. is being discussed
c. is discussed

5. The building site mostly with water.
a. is ... covered
b. will ... be covered
c. had ... been covered
6. The university of Michigan is one of the best universities in the United States and it in Ann Arbor.
a. located
b. are located
c. is loсated
7. This software by our IT specialist last month.
a. was developed
b. had been developed
c. is developed

8. The letters at the moment.
a. will be typed
b. are being typed
c. are typing

9. The first 3D printer by Chuck Hull in 1983.
a. was invented
b. has been invented
c. invented
10. Most people think that this device …… after its inventor.
a. be called
b. is called
c. was being called

11. We checked that all the dооrs ……. before we left the office.
a. were closed
b. are closed
c. had been closed

12. What a wonderful lecture! I’m sure it ….. even in a few years’ time.
a. will not be forgotten
b. will not forgotten
c. will be not forgotten