In 1970, the United States was still by far the most productive of countries in the world,
A. worked up to be
B. worked in being
C. worked on being
D. worked out to be
Alfred Binet used a large number of children in his tests because he wanted to find our______.
A. who were the most stupid
B. the differences between them
C. who were the cleverest students
D. a norm
We are told in general British people think snakes are______.
A. not very common in Britain'
B. usually harmless
C. more dangerous than they usually are
D. unlikely to kill people by their bite
If an adder hears you approaching, it will usually _______.
A. move out of your path
B. take no notice of you at all
C. disappear very quickly
D. wait until you are close then attack