21.   Robberies and muggings are common in the area.

22.   Social problems such as teen pregnancy, drug abuse, and high divorce rates are often common in the most advanced countries.

23.   Some expressions are more common in spoken English than in written English.

24.   Sudden mood changes are common in adolescent girls.

25.   The disease is still fairly common in many countries.

26.   These days is more common in spoken English?

27.   These plants are common in British gardens.

28.   They must be less common in wine-drinking regions and virtually unknown in strictly Mohammedan countries.

29.   This disease is more common in people who smoke heavily.

30.   Tuberculosis is still common in some parts of the world.

a. + in >>共 1080
involved 7.47%
born 4.61%
available 2.52%
active 2.03%
common 1.58%
alone 1.34%
high 1.19%
due 1.19%
popular 0.96%
successful 0.95%
common + p. >>共 46
in 49.44%
among 9.08%
to 8.65%
as 6.19%
for 4.03%
on 3.23%
than 3.20%
at 2.80%
throughout 2.30%
during 1.66%
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