Open the brackets and use the right tense of the verb:
Present Perfect or Past simple.
1. A month ago they (repair) all heating and cooling systems. 2. He
(get) an access to some data this week. 3. I don’t think I ever (see)
such a complicated gadget. 4. He (be) a reader of this IT magazine for
many years. 5. The date of the meeting (change) since yesterday. 6. He
(lost) his notebook and can’t remember when he last (see) it. 7. She
(perform) all these tasks on Wednesday. 8. (Sign) you the papers this
morning. 9. The other day I (meet) the manager and (tell) him about
our problem. 10. He (not call) us in the morning because he (be) very
busy. 11. I can’t tell you if I like this device, as I (not use) it before.

12. As I know they already (buy) a monitor and a keyboard. never
(write) programs.