A、BECAusE thEy hAvE signED A vEry importAnt ContrACt.
B、BECAusE thEy will lEAvE EArly tomorrow.
C．BECAusE thEy hAvE got A gooD night’s slEEp.
D．BECAusE thEy hAvE rECEivED gooD sErviCE From thE hotEl.