________, we tried our best to complete it.
Only one of our gifted students______to participate in the final competition.
The phrase "keeps sellers on their toes" in the passage mostly means "______".
The examination was not very difficult, but it was_____________________ long.
He_______________us but he was short of money at the time.
_______ has been a topic of continual geological research.
__________ John Kennedy was elected president, he was the youngest American President ever.
We all agree that she is____________________ student in our class.
Tom: "___________________ " Mike: "I won't say no!"
The packages___________________ so that it would be easier to carry them.
______ one of the most beautiful forms of performance art, ballet is a combination of dance and mime performed to music.