Having lived in China for 8 years, Helen has a good ____________ of both English and Chinese.
#12434
A
ability
B
guidance
C
command
D
program
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He knows several languages ________ English, French and Japanese.
#12423
A
such as
B
for example
C
namely
D
that is
There has been ____ accidents on this part of road. 
#14351
A
a number of
B
a great deal of
C
a series of
D
plenty of
The theory should____ practice, or it could just be something useless.
#11998
A
be applied of
B
is applied for
C
be applied for
D
be applied to