Which sentence uses the comparative form correctly?
A. Trains are more faster than cars.
B. Buses are more cheap than taxis.
C. Walking is slower than driving.
D. Cars are safest than bicycles.

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Choose the correct sentence.
A. If you don’t understand, please save your questions for the end of the presentation.
B. Please save your questions for the end of the presentation. If you don’t understand.
C. Please save your questions for the end of the presentation; if you don’t understand.
D. If you don’t understand; please save your questions for the end of the presentation.
