—Will you be____this afternoon, Jack? —It depends．I’m afraid I’ll be called by my boss．

At times, worrying is a normal, ________ response to a difficult event or situation – a loved one being injured in an accident, for example.

Some parts of the water are very shallow. But in some places it is veryvery ＿＿.

___ is known to all, China will be an _____ and powerful country in 20 or 30 years’time.

People are advised to be _____ towards the health concerns of their dear ones while burning firecrackers to celebrate the festival, for they contain harmful chemicals．