You can’t see things clearly through a telescope unless it is _____ correctly to your sight.

The ______ of air and water makes it impossible to live on the moon.

Xinhua said the landslide not only _____ power and communications, it also caused death.

The computer system broke _____ suddenly while he was searching for information on the Internet．

I met my old friend ____________ on my way home from school.

The highway has been closed because of the heavy snow. Please find an ________ means of transport.

I live at a busy street and the loud noise nearly ____me mad.