You will be late _____ you leave immediately.
Letterboxes are much more _______ in the UK than in the US, where most people have a mailbox instead.
I wish you’d do ________ talking and some more work. Thus things will become better.
Green products are becoming more and more popular because they are environmentally _____.
Fitness is important in sport, but of at least_______ importance are skills.
Small cars are ___ of fuel, so they have more appeal for consumers.