The model was forced by its propellers along a wire at a great speed, but so far as an observer could determine, failed to lift itself, notwithstanding its extreme lightness and the comparatively very great power employed. [Please select]
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That releases a spring which whirls the propellers until the spark is made, then off you go. [Please select]
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The propellers were pounding against it, and one of them was broken. [Please select]
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"Anyway, there it is," Frank replied, "and there the propellers are--one of them broken." [Please select]
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Had the concussion damaged the propellers so that the trip up the valley of the Amazon would have to be abandoned. [Please select]
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"Come," Harry cried, "we must get out of this now if we can get the propellers to working." [Please select]
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He moved to the back of the boat and bent down to look at the propellers. [Please select]
Do you have a better example in your mind? Please submit your sentence!