At times, worrying is a normal, ________ response to a difficult event or situation --- a loved one being injured in an accident, for example.
The conference had been held to discuss the effects of tourism ___ the wildlife in the rainforest.
Specialists may be useful to _____ a situation and suggest solutions.
Problems _____ because they were lack of communication.
While he was ______ about in the street, Mary came up to him.
---- I must be off now. See you! ---- ________. See you!