I often have conversations with John over ______ telephone, while I keep in touch with Tom by ______ letter.

A. /;the   B. /;a     C. the; /   D. the; a

I often have conversations with John over_______telephone,while I keep in touch with Tom by______ letter.

　 A. 不填; the　　　　　 B. 不填;a　　　　 C. the;不填　　　　　　 D. the;a

I often have conversations with John over _____telephone, while I keep in touch

 with Tom by _____letter.

A ./; the                  B. the; /              C. /; a                  D. the; a

I often have conversations with John over____ telephone, while I keep in touch with Tom by____letter.

A. /; the　 B. the; /　　 C. /; a　　 D. the; a

I often have conversations with John over ______ telephone, while keep in touch with Tom by ______ letter.

A. 不填；the B. 不填；a   C. the；不填 D. the; a