While other scientists are keeping____eye on changes in the H5N1 bird flu strain, the scientists in England are working on vaccines, in case it becomes highly infectious in ____humans.
I can’t tell you the exact time when I will get there ._______,I’ll be there as early as I can .
We should not judge a person by his _______and the clothes he wears .
As we sped down the highway ,the lights of the city ________before us .
Hiking by oneself can be fun and good for health .It may also be good for _______building .
You have got to fill in this _______form before we arrange for a job interview .