As you can see, the number of cars on roads _______ rising these days.  

A. keeping       B. keep           C. keeps       D. were keeping

As you can see, the number of cars on roads _______ rising these days.

A. we keeping      B. keep     C. keeps      D. were keeping

 As you can see, the number of cars on roads _______ rising these days.

A. we keeping   B. keep C. keeps    D. were keeping

As you can see, the number of cars on roads ________ rising these days．

1. A.
   was keeping
2. B.
   keep
3. C.
   keeps
4. D.
   were keeping