Some Math problems are        difficult for the students         work out.
#53037
A
so, that
B
not, but
C
such, that
D
too, to
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We can’t put off _____ a plan .
#55162
A
make
B
to make
C
making
D
to making
Li Ping ______ a happy family.
#61173
A
is
B
have
C
has
D
there is