Weshould_________oilandgasbymakingfulluseofotherenergysources. A: reserve B: conserve C: maintain D: sustain

Weshould,therefore,learntochooseourwordscarefullyandusethemaccurately,ortheywillmakeourspeechsillyandvulgar.

Weshould be aware that this kind of rare bird was on the list of human (protect) _____.

Weshould do all ____ is useful to people. A: B: that C: it D: which

Weshould（）thenationalflagwhenthesunsets. A: lower B: lowed C: lowing D: lowers

Theair-conditionerisrunninginthewinterandtobestopped,weshould（） A: closeFanandHumidifieratthesametime B: firstlycloseFanandthenclosehumidifierimmediately C: firstlyclosehumidifierandthencloseFanimmediately D: firstlyclosehumidifierandthencloseFanafter30seconds

Weshould（）thosebadhabits. A: getrid B: getof C: getridof D: rid

Weshould（）thenationalflagwhenthesunrises. A: hoist B: hoists C: hoisting D: hoisted

Astimeislimited,weshould（）otherworkandfocusonthisproject. A: putup B: putaside C: putout D: puton

The train must be running late; weshould have got to Beijing （） A: by now现在 B: by now