The loss of ability in the mother tongue is mainly caused by the         use of electronic devices and a lack of attention to culture.

The increase of the number of the students makes the limited computers not ________ to each student.

If the manager had to choose between the two, he would say John was ＿＿＿＿＿choice. 

 Speech is ______ heard when it is given in a clear voice just slightly louder than normal.

A new __________ bus service to Tianjin Airport started to operate two months ago.