He left the place , _____ never ______ back again.

Julia，if you hurry up，I think it quite ______ that you will catch the next train.

Maria is a _____ person and never makes any unreasonable demands.

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

For our middle school students, some courses are compulsory, while others are ________.