There is a mistake in the four underlined parts of each sentence. Find the mistake (A, B, C, or D ) and correct it.
1.Water pollute(A) in the lake has (B)made(C) the fish die. (D)
2. Factories (A)don’t (B) dumpwaste into(C) rivers if the government fines them heavily.
3.The earthquake occurred (A)at midday (B)when many (C)people had (D)lunch.
4.Hundreds(A) of houses destroyed(B) after a tornado hit (C) the small town (D)of Texas.