On Monday morning, John got up late. So by the time he got to the bus stop, the bus ________.

1. A.
   left
2. B.
   leaved
3. C.
   had leaved
4. D.
   had left

On Monday morning some teachers exchanged a few ________．

1. A.
   how-are-yous
2. B.
   of how-are-you's
3. C.
   how-are-you's
4. D.
   of how are you

On Monday morning, John got up late. So by the time he got to the bus stop, the bus ________.

[　　]

On Monday morning, John got up late. So by the time he got to the bus stop, the bus ________.

[　　]

On Monday morning, John got up late. So by the time he got to the bus stop, the bus ________.

[　　]