Weve signed an agreement and we cant______of it now.A．back downB．back offC．back upD．back o

An agreement was reached on the _____ of mutual respect and mutual interest.A: basicB;

An international treaty signed several years ago bans trade in plants and animals of enda

We met Rihana and her husband at a party two months ago. ______ weve had no further commun

Pakistani and U. S. officials have formally signed an agreement before they______.A．fought

Weve arranged to go to the cinema on Wednesday, but we can be______and go another day if n

Its an odd paradox: thanks to cell phones, PDAs and the Internet, weve never before been i