Scientists believe Native Americans arrived by crossing the land bridge that connected Siberia and _________ more than 10 000 years ago.
I really _____ thank you enough. It’s been an amazing day.
16. The computer program is a puzzle to me. The more I think of it, the more questions I think of _____.
Realizing I would be late , I quickly dressed my son and _____ my bag, went to work.
Hard work and lack of sleep has _____ her beauty and youth in recent years.
In order to _____ the development of the west of our country, many special policies have been made, such as encouraging people to go to work in the west.