In that school, English is compulsory for all students, but French and Russian are ______.

Many rules in English are ______, and large numbers of students feel ______ them.

 Mr. Smith,       with the       result of the experiment, sat on the chair, smiling.

The situation is ________—we have no food,very little water and no medical supplies.

A _______ number of mothers with young children are stopped from undertaking paid work because they lack access to childcare.