[ Idioms ]
He answered the question __ the spot.
A. in
B. on
C. at
D. to

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Grammar › ViewElectron storage rings ___ in investigations of the structure of materials.
A. They are used
B. That are used
C. Used
D. Are used
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Complete each sentence by adding the adverb in the form indicated: Kayla swam _____ than her sister. (frequently, comparative)
A. most frequently
B. frequently
C. more frequently
D. frequenter
Grammar › ViewJean has a …………. arm.
A. sore
B. soar
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What type of sentence is: Did you wear your boots today?
A. iterrogative
B. declarative
C. exclamatory
D. imperative
