English has been called (26) ________ international language for more than a century. The number of people (27) _________ speak English as their mother tongue has been estimated at between three hundred millions (28) ________ four hundred millions. It is considered as an  official language in many countries where 1.5 billion people live. In Viet Nam, we use English as an official second (29) __________. Most children learn English at school. English is also a compulsory subject for students in many schools. Even a lot of adults continue to learn in many courses or evening classes. Most of them learn English because it is necessary for their jobs. Nowadays in sufficient (30) ___________ of English can be a problem in business.

Read the following passage and choose the letter A, B, C, or D to fill in each of the numbered blanks.

English has been called (26) ________ international language for more than a century