The number of people (27) _________ speak English as their mother tongue has been estimated at between three hundred millions (28) ________ four hundred millions.
27/40
Read the following passage and choose the letter A, B, C, or D to fill in each of the numbered blanks.
The number of people (27) _________ speak English as their mother tongue has been estimated at between three hundred millions (28) ________ four hundred millions.