We have been waiting in this queue in over three hours.
=> for
_______ has been a topic of continual geological research.
The phrase "keeps sellers on their toes" in the passage mostly means "______".
The boat was sailing north when a terrible storm_____________ .
He_______________us but he was short of money at the time.
According to critics of globalization, several developed countries have become rich because of
______ one of the most beautiful forms of performance art, ballet is a combination of dance and mime performed to music.
Tom: "___________________ " Mike: "I won't say no!"
She asked me______I was looking at.
I am sorry I have no time at present to____________________ detail of our plan.
The Lake District,____________________ was made a national park in 1951, attracts a large number of tourists every year.