When is the World Book and Copyright Day(世界读书日)— It’s ___________23 April.

What does the model plane look like? — Well, the wings of the plane are _____ of its body [ ]

The teaching building has fivefloors. My classroom is ______________ the third floor.

Tell John not to leave the house unless he ________ that the lights ________.[ ]

The man in black has two children, one of whom _______ in a foreign country.