Be careful with those fireworks; they

1、Place names used should be those （）.

Place names used should be those （）.Aspecified by international authoritiesBspecified by national authoritiesCon standard mapDon the chart or Sailing Directions in use

2、Be careful（）mix the inflammable cargo

Be careful（）mix the inflammable cargo with that kind.Ado notBwill notCshall notDnot to

3、Care must be taken to condition the （）

Care must be taken to condition the （）in the boiler to prevent scaling, and corrosion, which can weaken the pressure vessel.AwaterBfuelCsteamDair

4、Be careful,（）you'll fall down.

Be careful,（）youll fall down.Aon the contraryBor ratherCor elseDas for

5、Particular care should be（）in selectin

Particular care should be（）in selecting CESs in areas where Ocean Regions overlap.AtakenBtakeCtookDtaked

6、They kept all important documents care

They kept all important documents carefully locked in a __________．AstorageBsecurityCsafeDstore