In our class there are 46 students, _____ half wear glasses.
A. in whom B. in them C. of whom D. of them
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
