21.   The study blamed economic recession for the current weakness in oil prices and consequently the economic difficulties in Gulf states, which depend heavily on crude and gas exports.

v. + recession >>共 130
avoid 9.86%
define 8.80%
enter 5.61%
avert 5.61%
cause 4.70%
prevent 4.25%
blame 3.19%
trigger 2.73%
face 2.28%
weather 2.28%
blame + n. >>共 1810
attack 4.60%
government 2.54%
rebel 2.32%
problem 1.96%
death 1.96%
loss 1.52%
lack 1.45%
group 1.31%
delay 1.26%
decline 1.21%
recession 0.22%
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