For many years, ____ animals for carrying food and other supplies from one area to another has been a means of living in Xinjiang Autonomous Region .
— Is it for two months ________ they have stayed here? — No. It’s only three weeks ________ they arrived here.
We should not let our grandparents who are too old and weak ________ alone.
The bank, whose walls are painted white, ________a safe and reliable place.
All the neighbors admire this family, ________ the parents are treating their child like a friend.
We have just heard a warning on the radio ________ an earthquake is likely to strike that area again.