1) What has he been doing? 2) How long have Mary and John been watching TV? 3) How long has Karen been living in Tokyo? 4) What have they been waiting for? 5) What have they been drinking? 6) What has Linda been playing? 7) What has Don been doing? 8) Why is he crying? 9) What have they been learning for the last two months? 10) What have they been doing recently?

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