Although he failed when he tried doing the experiment for the first time, he decided to try it____.
#70436
A
once in a while
B
at once
C
once more
D
once
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 When I went into her room, she was ________ in her work.
#63962
A
absorbed
B
controlled
C
exposed
D
developed
Once you __ working with the professor, you will find he is not as tough as expected. 
#66691
A
become accustomed to
B
object to
C
are opposed to
D
admit to
As there was no one she could________, she felt very helpless.
#64145
A
turn to
B
turn on
C
turn off
D
turn over