I sent invitations to 80 people, ______ have replied.
A. of whom only 20
B. only 20 of those who
C. of whose only 20
D. only 20 who
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I regret ______ harder at school.
A. not to have worked
B. not having worked
C. not have worked
D. having not worked
Gestures, a body language of human beings, ______ widely from culture to culture.
A. change
B. vary
C. differ
D. alternate
When the fire ______, the house was made empty.
A. broke into
B. broke out
C. was happened
D. was broken out
______ intelligence is largely inherited; it"s hard to find out the sources of IQ differences between two individuals.
A. If only
Because
C. Even if
D. When