When shifting gears with a manual transmission, the clutch must be:
always be pushed all the way to the floor
When shifting gears, you should:
be able to shift without looking at the pedals or shift lever.
The friction point of the clutch is the point at which the clutch pedal is:
let up part way to a point where the engine starts to move the vehicle
When shifting from first to second, the correct procedure is:
clutch pedal down, shift, accelerator pedal up
First gear in a vehicle with a manual transmission should be used for speeds up to approximatley:
15 mph
fourth and fifth gears are generally engaged at speeds over:
40 - 50 mph
When you park and leave a manual-shift vehicle, it is best to set the parking brake and shift to:
both a and c are correct (first gear and reverse)
"Riding the clutch" will:
rapidly wear the clutch's surface
If you do not operate the clutch properly you could:
all the above are correct (stall your engine, experience bumpy jerks, have vehicle jerk forward when you attempt to accelerate)
You are driving a manual-shift vehicle in third gear at 30 mph and you plan to turn right at the next intersection. The street has a slight uphill grade.

It is best to:

downshift to second gear and slow before the turn.