In Autumn the ground is always covered with ________．

1. A.
   fallen leaves
2. B.
   fallen leaf
3. C.
   falling leaves
4. D.
   falling leaf

Power stations employ ________ water to produce electricity.

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When Li found Miss Lin in the office, she ________ .

1. A.
   fell asleep
2. B.
   would be falling asleep
3. C.
   had fallen asleep
4. D.
   were sleepy