I find that looking after children is a fun and challenging job ___________ you need to be patient and careful．
A．That B．which C．where D．when
___________ we can have clean drinking water lies in ___________ effective measures will be taken by the government about water pollution.
A．Whether；that B．If；that
C．Whether；what D．If；what
There are many new central leaders in China now, ________ many once worked in the western provinces.
A．in which B. of whom C．in whom D．for whom
Both students and parents appreciate the great importance schools have ______to eyesight protection.
A. reacted B. attended C. attached D. adapted
--- Cathy, why does your roommate look angry?
--- I’m also feeling puzzled. Maybe I ______ a nerve while asking about her former boyfriend.
A. have touched B. was touching C. had touched D. touched
It is obvious ______ the local government can do to protect the environment for the next generations.
A. how B. what C. that D. which
