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. _____is known to us all is that the old scientist, for____ life was hard in the past,still works very hard in his eighties.

A.As; whom           B. What; whom          C. It; whose          D. As; whose

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Have you ever noticed the colour of the water in a river or stream after a heavy rainfall? What do you think caused this change in colour? It is soil that has been washed into the river from the riverbank or from t}le nearby fields.

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