The citizens of Beijing are proud of _______ they have done to make Beijing a beautiful city.
#16270
A
that
B
which
C
what
D
how
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Cars do cause us some health problems, in fact, far more serious ________ than mobile phones do.
#15229
A
one
B
ones
C
it
D
those
In the past few years, a great many teachers have found very important to teach their students how to learn.
#15543
A
this
B
that
C
one
D
it
I like __________in the early morning when the air is fresh and I can take a walk around the garden.
#15615
A
that
B
it
C
which
D
what