C. Choose the correct words

1) There was a slight/slightly rise in profits last month.

2) There was a sharp fall in/of our sales last month.

3) Our sales fell by/of 6% last quarter.

4) Inflation is increasing slow/slowly at the moment, in/by about 1% a year.

5) There is a slow/slowly increase in the rate of inflation, of/by about 1% a year.

D. Complete the chart below with the past form of the verbs from the box.