Поставьте глаголы в скобках в Present Perfect
или Past Simple.


1) These tasks … (have) many
difficulties.


2) … production managers … (analyse) these data
yesterday?

3) A constructor … (build) a house.

4) They … (investigate) the problem a week ago.

5) Inflation … (affect) on the economy a lot.

6) Early settlers … (preserve)
meat by drying and salting it.


7) They … (just/elect) the president of the company.

8) The children … (skate) on the frozen pond last
winter.

9) The department … (already/mail) out 200 notices.

10) When he … (return) home they … (not/be) ready.

11) The Olympic committee … (announce) the results.

12) We …(be) here since ten o'clock. 
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