绝对正确 我做过
crossing
watch
green
stop
until
make
difference
must not
or
safe
http://cache.baidu.com/c?word=do%2Cyou%2Cusually%2Cwatch%2Cthe%2Clights%2Ccarefully%2Cwhen&url=http%3A//zgqzx%2Ecom/c233%2Edoc&p=9e3f841b8b904eac59bd9b7c5c00&user=baidu
crossing、watch、green、stop、until、make、different、mustn~t、otherwise、safeties.
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