Prices____ all the time and no one knows when they stable.
---It’s a long time since I saw my sister. ---___________ her this weekend?
——I’m sorry that I didn’t work out this problem. ——It’s ___________our ability. I didn’t work it out, too.
The manager suggested an earlier date ____________ the meeting.
The Chinese are good at table tennis ___________the English are interested in football.
Some pre-school children go to a day care center, __________ they learn simple games and songs.