Read the word combinations out loud.
at half past three
at half past eight
at half past twelve
 
a difficult exercise
an easy exercise
easy and difficult exercises
 
to keep fit
to keep to a diet
to keep regular hours
 
to choose presents
to choose a diet
to choose a game
 
at a quarter to three
at a quarter to seven
at a quarter to eleven
 
healthy ways
a healthy diet
healthy food
 
once a year
once a week
once a month
 
without success
without love
without help