Ответ:

1) A new technology for studying the radioactive background of the environment was developed by the research institute.

2) Did you send for me , mrs Rigbi?

3) Could you sent me a copy of the contract?

4) English language courses at our university are held at a very high level.

5) He must come to dinner on time.

6)Yiu do not say , he resigned?

7) She is probably in the research center.

8) An important telephone conversation is probably over.

9)Are you invited to a corporate party dedicated to the founding day of the company?

10) Can you send me a report by e-mail?