The young man made a _________ to his parents that he would try to earn his own living after graduation. 

.You should not show any ___ for the students who get caught cheating in examinations.

At first ______, the bag seems made of real leather. But actually it is just an imitation.　 

They decided to leave the waiter a big _____ because the food and service had been excellent.

 The need for an operation，especially an immediate operation， almost always comes as a ______ to the patient and his family.