I found it very hard to ____ between the two sounds.
______ one of the most beautiful forms of performance art, ballet is a combination of dance and mime performed to music.
Only one of our gifted students______to participate in the final competition.
_______ has been a topic of continual geological research.
The examination was not very difficult, but it was_____________________ long.
Tom: "___________________ " Mike: "I won't say no!"
As a millionaire who liked to show off her wealth, Mrs. Smith paid______________________________________________ we asked.
Education in many countries is compulsory________the age of 16.
The phrase "keeps sellers on their toes" in the passage mostly means "______".
There has been a great increase in retail sales,_____________________ ?
Standing on the tip of the cape,____________________ .