The equipment is very old．It’s not worth（）.

A.moved and fitted again
B.removed and refitted
C.reproduced and put on again
D.returned and attached again

A.has repaired
B.is being repaired
C.is repaired
D.will be repaired

A.repairing or replacing
B.to repair or to replace
C.being repaired or replaced
D.to be repaired or replaced