He turned off the lights before going out ________waste electricity.
We must push the piano to the corner of the hall to_____________________ our party tonight.
The packages___________________ so that it would be easier to carry them.
He_______________us but he was short of money at the time.
She asked me______I was looking at.
Education in many countries is compulsory________the age of 16.
The examination was not very difficult, but it was_____________________ long.
The Lake District,____________________ was made a national park in 1951, attracts a large number of tourists every year.
______ one of the most beautiful forms of performance art, ballet is a combination of dance and mime performed to music.
______ his brother, Mike is active and friendly.
The phrase "keeps sellers on their toes" in the passage mostly means "______".