Choose the word (a, b, e, or d) that best fits each of the blank spaces. 
The Nile (21)____in a stream which flows (22)_____ Ruanda into Lake Victoria. (23)____it leaves Lake Victoria, the river is known as the White Nile and flows through the Sudan. (24)____north it becomes the Nile and flows through Egypt past Cairo into the Mediterranean Sea. 

(22)........ 

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