Some scientists say it is essential that mankind _______ the amount of air pollution in big cities

1895. Some scientists say it is essential that mankind _______ the amount of air pollution in big cities.
A. be reduced
B. reduced
C. reduce
D. will reduce
1900. _ “She‟s the best pianist in the school.” _ “__________”
A. That‟s that.
B. Never mind!
C. That‟s OK!
D. You can say that again.
1901. The river divides the city __________ two parts.
A. with
B. between
C. by
D. into
1902. When I was young, I __________ to smoke or drink.
A. wasn‟t used
B. didn‟t used
C. never used
D. not used
1903. “Would you mind turning the fan on?” - “__________.”
A. Yes, please
B. No, thank you
C. Not at all
D. No, I‟m not
1904. __________ he gets to the airport, he‟ll check in his luggage.
A. Wherever
B. However
C. Although
D. As soon as