---When ______ again?  ---When he ______, I’ll let you know.

   A. he comes; comes          B. will he come; will come   

   C. he comes; will come       D. will he come; comes

—When ________ again?

—When he ________, I'll let you know.

---Do you know when she _________?
---Sorry, I don’t. But I’ll let you know when she _________.

 “When he _____ is not known yet.” “But when he ____, he will be warmly welcomed.”

A．comes, comes                          B．will come, will come

C．comes, will come                        D．will come, comes

I don't know when he ___. But when he ___ back, I’ll let you know.

A. comes ; will come   B. will come; comes  C. comes;comes   D. will come; will come