A:all
B:both
C:nothing
D:none
We must finish our homework ____ (one).
Water is very dangerous sometimes. So we must be careful ______ it.
下列各项中属于违法行为的有( )
①故意损害公共设施 ②在公交车上未向老者让座
③携带管制刀具进入校园 ④偷窃财物