All the photographs in this book, _______ stated otherwise, date from the 1950s.
A. unless B. until C. once D. if
The limits of a person’s intelligence, generally speaking, are fixed at birth, but ________he reaches these limits will depend on his environment.
A. where B. whether C. that D. why
The police still haven’t found the lost child, but they’re doing all they .
A. can B. may C. must D. should
They are broadening the bridge to ________ the flow of traffic.
A. put off B. speed up C. turn on D. work out
There are a small number of people involved, possibly ______twenty.
A. as few as B. as little as C. as many as D. as much as
Only after Mary read her essay the second time the spelling mistake.
A. did she notice. B. she notice.
C. does she notice D. she has noticed
