Only ________ according to the directions can the medicine be quite effective.
#89142
A
taking
B
taken
C
being taken
D
having been taken
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To succeed in a scientific experiment _____ .  
#98179
A
carefulness is need
B
carefulness is one needs
C
one needs to be careful
D
one need being careful
We are invited to a party _________in  our club next Friday.  
#98989
A
to be held
B
held
C
being held
D
holding