Half an hour's exercise a day ________ doctors away.

A. keep

B. keeps

C. is keeping

D. kept

 I can’t stand him _____ talking.    A. keeps    B. keeping   C. to keep    D. kept

My friend Tom _______me __________ for an hour yesterday.

A．keep; wait                             B．keeping; waited

C．kept; waiting                           D．keeps; to wait

My friend Tom _______me __________ for an hour yesterday.