1 . The dentist is not a________ this afternoon, as he has an important conference to attend. （根据首字母单词拼写）

2 . Because of the snow, the village was not ________ by car.

A．acceptable

B．accessible

C．approachable

D．available

3 . It is reported that Baidou navigation (导航) system will be a________ to every user in any corner on this planet. （根据首字母填空）

4 . I’m afraid I’m not ______ to help with the talent show, for I am occupied with my own project.

A．reliable

B．convenient

C．available

D．accessible