It is generally believed that teaching is ___________it is a science. 
#4916
A
an art much as
B
much an art as
C
as an art much as
D
as much an art as
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.If _____,the experiment will be successful.
#4718
A
carefully doing
B
it done carefully
C
carefully done
D
doing carefully
His suggestion is worth_____.
#4687
A
consider
B
considered
C
to consider
D
considering
_________to reach them on the phone, we sent an email instead.
#4947
A
Fail
B
Failed
C
To fail
D
Having failed