OneoftheresponsibilitiesoftheCoastGuardistomakesurethatallships______followtrafficrulesinbusyharbors.
A、convenientlyB
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Inordertobuyanewcar,youshouldatleast______onehundreddollarsaweek.
In1900,theenergyderivedfromburningpetroleumwasonlyfourpercent______ofcoal.
______thepopularityofrobotsinJapan,thecountry’srobot-productiongrowthisslowingdown.
Hecomplainedtothebooksellerthattherewereseveralpages______inthebook.
Homingpigeonisusefulasa______carrierbecausewhentakenfromhome,itwillreturnatthefirstopportunity.
