A．Conservation of forests is not an easy task.
B．Smoking in forests are only allowed in some safe areas.
C．Lighting accounts for most of forests fires.
D．New breakthroughs have been achieved to control lightning strikes.

A．She really cannot learn math well without other’s help.
B．Mathematics is the last subject she wants to learn.
C．Michael is the only student who ever helped her with math.
D．She does not want Michael to go to another school.