Acid fog______

A:falls down when the atmosphere is moist B:is not as frequent as acid rain C:often falls in the region of Manchester, England D:is as damaging as acid rain

The search was （　） when the fog got thicker.

A:called off B:called on C:called in D:called for

The ship ______ from behind the fog.

A:drove B:emerged C:passed D:turned

The search was ______ when the fog got thicker.

A:called off B:called on C:called in D:called for

The search was ______ when the fog got thicker.

A:called off B:called on C:called in D:called for

In a fog everything looks vague.

A:uncertain B:uneasy C:unclear D:unexpected

In a fog everything looks {{U}}vague{{/U}}.

A:uncertain B:uneasy C:unclear D:unexpected