( )1. Countries with _____ population should pay attention to the environment.
A. large B. many C. much D. more
( )2. China’s population is about 20_____ of the world’s population.
A. times B. more C. percent D. person
( )3. it ______me half an hour to get to school ______ foot.
A.takes; by B.spends; on C.takes; on D.spends; by
( )4. 3.we should protect animals _______ danger.
A.of B.to C.for D.from
( )5. ______ of the teachers