Choose the word which is stressed differently from the rest

Don't drink that water. It's . . . . . *
A. damaged
B. dumped
C. contaminated
D. pollution

Choose the word which is stressed differently from the rest. *
A. grammar
B. listen
C. repeat
D. chemical

Water ___________ in the lake has made the fish die. *
A. pollution
B. pollute
C. polluted
D. polluting