Most parents are not __________ the danger of their babies’ eating jelly, which causes most unfortunate incidents to happen[ ]

The number of people in the party _____fifty, but a number of them ____ absent for different reasons. [ ]

While listening in class, you should concentrate ____ your teacher.

The machine _____ It hasn’t worked for years and noone wants to repair it

It is necessary for us to________these interesting old customs.[ ]