Between two rows of trees _____ the teaching building.

A. stand　　            B. stands　　            C. standing　　　     D. are

There are rows of new buildings, ________ trees and flowers are being planted.

1. A.
   in front of them
2. B.
   around them
3. C.
   around which
4. D.
   in the front of that

Between two rows of trees _____ the teaching building.

1. A.
   stand
2. B.
   stands
3. C.
   standing
4. D.
   are

There are rows of new buildings, ________ trees and flowers are being planted.

[　　]

There are rows of new buildings, ________ trees and flowers are being planted.

[　　]