20．As I will be away for at least a year, I’d appreciate 　　　　from you now and then 　　　　me

how everyone is getting along.　

A．hearing ; tell　　　 B．to hear ; tell　　　 C．hearing ; telling　　 D．to hear ; to tell

19．_____, I think, and the problems could be settled.

　　 A．A bit more efforts　　　　 　B．Making greater efforts

C．If you double your efforts　　　 　D．So long as you make more efforts