4. Circle the correct answer: 1) We’ll continue the investigation until / when we find the murderer. 2) I turned on the light until / as soon as I arrived. 3) Amy left for work after / until she had breakfast. 4) Helen waited as soon as / until it got dark. 5) She ran to the police station after / until she saw the thief. 6) Please turn off the computer when / after you leave.

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