、Tom is a top student in our class , How it be that he was a failure in the last exam?
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.
---John, there is ______ Mr. Wilson on the phone for you.---I'm in ______ bath.
The teacher, with 6 girls and 8 boys of her class, _______ visiting a museum when the earthquake struck.
All the employees except the manager ______to work online at home.
____with the size of the whole earth , the biggest ocean does not seem big at all .