799.When driving downhill: (A) Turn off the engine and coast in neutral to save fuel. (B) For safety, never turnoff the engine and coast in neutral. (C) No gear change needed.

807.When changing lanes on a freeway or expressway, in addition to displaying the turn signal, the mostimportant thing is: (A) Merge into any available space immediately. (B) Only watch for the safe distancefrom the vehicle ahead. (C) Watch for safe distances from both the vehicle ahead and vehiclesapproaching from behind.