--- Can you tell me how to improve my English?
--- Do more speaking, I think , ________you will be good at spoken English.

--- Can you tell me how to improve my English?

--- Do more speaking, I think , ________you will be good at spoken English.

A．or               B．for               C．and              D．until

--- Can you tell me how to improve my English?
--- Do more speaking, I think , ________you will be good at spoken English.

1. A.
   or
2. B.
   for
3. C.
   and
4. D.
   until

---- Can you tell me how to learn English well?

---- Do more speaking, I think, ______ you will not be good at spoken English.

---- Can you tell me how to learn English well? 

---- Do more speaking, I think, ______ you will not be good at spoken English.

1. A.
   then
2. B.
   and
3. C.
   or
4. D.
   until