“They are required to keep a twometer________from everyone else during the quarantine (隔离)period,” experts say.
________a US visitor visa twice , the young man finally gave up his hope of going to America to Christmas Day.
“Do you mind if I look at your notes?”“Of course not .______”
________eastward,________ you’ll pass mountains and thousands of lakes and forests.
In western culture,21 was the age________ young people traditionally received a key to their parents’ door, as a symbol of entering adulthood.
It’s easy to become ________to the children you work with.