They ________understand what the sign on the wall means.

1. A.
   maybe
2. B.
   maybe
3. C.
   may
4. D.
   are

I _______understand the girl _______I finished reading her story．

A．don't; since       B．didn't; since          C．don't; until                  D．didn't; until

___________ to understand this sentence．

A．That’s difficult    B．I’m difficult    C．It’s difficult for me  D．I feel that difficult

 I ______ understand why Steven bought so many watches but never wear______ of them.   
A. needn’t, some  B. must, all    C. may, none    D. can’t, any

I understand the beginning of who I am because of the program．(改为同义句)

______ ______ the program，I understand the beginning of who I am.