Complete the sentences with the correct time expression. 1)it39;ll be dark

Complete the sentences with the correct time expression. 1)it39;ll be dark __ we get home.(while / by the time ) 2) The computer won39;t work __ you plug it in ! ( after / until )3) __ it is nine o39;clock,lessons begin. ( As soon as / While)4) Leo will have a great time __ he is in Cairo. ( by the time / while) 5) My parents will be pleased __ they get my exam results. ( when / until) 6) Elsa is going to look for a flat __ she arrives in London. ( after /while )