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Fill in the correct tense.
1.I'm not sure when the guests............ (arrive).
2. He'll join us when he .......... (be) ready.
3. Do you know when they.............. (come back)?
4. His father will be angry when he .............(find) him missing.
5. She will call us when she.........(get) to the airport.
6. Can you tell me when John........(finish) work?​