21.   The simplest models assume that earnings grow at a constant rate of g percent per year.

22.   The tetanus bacteria grow at the site of the injury and release a toxin which produces rigid muscles and muscle contractions.

23.   The urban population has grown at a faster rate than the rural population.

24.   The use of IT in areas such as accounting and finance has grown at an astonishing rate.

25.   Voice over Bamboo grows at an amazing pace.

26.   Where he stood the grass was growing at an amazing rate it slipped over his shoes and up into his trousers.

27.   The company had been growing at breakneck pace until last year.

28.   The rate at which hair grows can be agonisingly slow.