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1 d
2 a
3 b
4 b
5 c
6 a
7 b
8 c

2  1 I have been packing my case all the morning.
     2 She hasn't been cooking since 3 o'clock.

3  1 The old lady was bitten by the dog.
   2  The chess are played by us every day.
   3 Five hamburgers were eaten by Tom and me.
   4 My e-mail is checked by me every day.