Do you think that bridge               2000 meters long? It doesn’t appear  ______long. 

—Must I turn off the gas after cooking ? —Of course . You can never be _______ careful withthat.

-- Do you think it's a good idea to make friends with your students?--  _____  , I do. I think it's a great idea.

. ---Do you get together with your old friends?---Yes, from time to time, but not ___ ___.

Nearly 200 people entered the area ______ to mine diamonds in 2000, and eventually had to be driven off by the police.