The boy is very interested in football but in fact he is not very good for playing it.
The phrase "keeps sellers on their toes" in the passage mostly means "______".
______ one of the most beautiful forms of performance art, ballet is a combination of dance and mime performed to music.
_______ has been a topic of continual geological research.
__________ John Kennedy was elected president, he was the youngest American President ever.
The boat was sailing north when a terrible storm_____________ .
Supporters of free-market globalization point out that_____________________ .
______ his brother, Mike is active and friendly.
Education in many countries is compulsory________the age of 16.
Only one of our gifted students______to participate in the final competition.
It is stated in the passage that____________________ .