John is very lazy. He falls ______ behind in his studies.
Shelly has been preparing carefully for the driving test so that she can be sure of passing it at her first________.
An experienced doctor usually judges a patient’s illness according to the various________.
Independent innovation has brought us a________in profits,40% higher than in the traditional way.
The ________ of school leavers that go to university is about fifty percent.
The generation________makes it difficult for parents to understand their children’s opinions.