At times ,worrying is a normal, ________response to a difficult event or situation—a loved one being injured in an accident , for example.
The Nile River ____ flood large areas but now the water ____ produce electricity.
So difficult ____that no one could ___ a good solution to it.
When we arrived, she went straight to ___ kitchen and started to prepare ___ meal for us.
____they decide which college to go to, students should research the admission procedures.
The time and effort he has devoted during the past few years____ trees in that remote area is now considered to be of great value.