—Do you like Nack ?

—Yes , Nack is good , kind , hard –working and intelligent;       , I can’t speak too highly of him .

A．as a result

B．in a word

C．by the way

D．on the contrary

A continuous sounding of a fog-signal apparatus indicates（）.

A.the vessel is in distress

B.the vessel has completed loading dangerous cargo

C.it is safe to pass

D.the vessel is anchored