The most important thing about my job is ______ I help protect ordinary people from the volcano.
A．how B．that C．what D．不填
Everyone here will thank the firefighter for the things they have done to prevent fires______ the environment safer.
A．make B．to making C．to make D．from making
The 16th Asian Games started ________ November 12 th, 2010 in Guangzhou.
A．on B．at C．in D．by
David wants to be ________ engineer while Cathy wants to be ________ doctor.
A．an; the B．the; the C．the; a D．an; a
Nowadays，scientists are working hard to find a best way of treating addictions ________ drugs.
A．of B．in C．on D．to
It was so ________ having to sing in public.
A．embarrassed B．embarrassing C．nervous D．embarrassingly
