Most experts agree that washing hands regularly is a ______way to prevent the spread of many diseases.
#17923
A
powerful
B
illegal
C
painful
D
awful
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Although she has a lot of problems, she manages to remain ________.
#19052
A
optimistic
B
cautious
C
concerned
D
upset
 I'd like to be a professional singer, but I don't think I've got ________.  
#20605
A
a good voice enough
B
a good enough voice
C
a voice enough good
D
an enough good voice
 Last night we met with _________ accident on the way home.
#20398
A
a quite strange
B
too strange an
C
such strange an
D
a so strange