You try first.
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anonymous a) There's a party at Mary's house next week.
having
Next week ......................................... party at her house.
b) When you phoned me, it was my lunch time.
I
When you phoned me ............................................................................ lunch.
c) I started working here three years ago.
for
I've .....
Answer deleted by Rover_KE.
The OP was asked to try first, anonymous—not you.