Hot metal ________ as it grows cooler.
A、contractsA
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The director recommended that she ________ (study) more English before going abroad.
Night ________ (fall), we hurried home.
Thedirectorrecommendedthatshe________(study)moreEnglishbeforegoingabroad.
Agreatnumberofsmallpowerstations________(setup)intheircounty sinceliberation.
Abeamoflightwillnotbendroundcornersunless________(make)todosowiththehelpofareflectingdevice
