_____ with the size of the whole earth, the biggest ocean does not seem big at all

1. A.
   Compare
2. B.
   Comparing
3. C.
   Compared
4. D.
   To compare

_____ with the size of the whole earth，the biggest ocean does not seem big at all.

A．Compare

B．Having compared

C．Comparing

D．Compared

___________ with the size of the whole earth, the highest mountain doesn't seem high at all.

A. When compared                   B. To compare

C. While comparing                 D. It compared

__________ with the size of the whole earth，the highest mountain doesn’t seem high at all.

A.When compared                              B.To compare?

C.While comparing                                   D.It compared?

with the size of the whole earth, the highest mountain doesn't seem high at all.

    A. When compared                   B. To compare

    C. While comparing                 D. It compared