To the sea captain's surprise, he found that ________ travel could also be quite pleasant.
#6817
A
earth
B
land
C
ground
D
playing
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Father went to his doctor for ________ about his heart trouble .
#5750
A
an advice
B
advice
C
advices
D
the advices
Please refer to the   before you switch on the engine.
#5486
A
introductions
B
explanations
C
instructions
D
expressions