Have you heard about Lake Baikal? It Russia. It contains B of fresh wa only be found in this lake. Scientists who visit Baikal C enjoy beauti see nature at its best. While I D the water. You must be careful whe Everybody who E nature will

The sentence requires a verb to complete the clause "It contains B of fresh wa". The options provided are: 1) deeper, 2) a lot, 3) can, 4) am, 5) loved. The most appropriate word to fill the blank is 'a lot' to indicate a large quantity of fresh water. Therefore, B should be 'a lot'.