. You can’t see things clearly through a telescope unless it is ________ correctly to your sight.
It is not who is right but what is right is 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________.
The Great Wall is _________________ tourist attraction that millions of people pour in every year.