Many years ago, he dreamed of becoming the first person __________ both South and North Poles.
The old pianist requested that he ____ the piano in the public again.
It is not who is right but what is rightis of importance.
You must watch carefully everything _____ the teacher does in class.
She didn't come to his birthday party just_____ what he had said to her the day before.
Drivers are warned that it is dangerous to talk on the phone while________.