I doubt _______ they can complete the bridge ahead of time.
A、whetherB
这里表示的是：来的方式，要用how.
Peopletodayarehighlyconcernedaboutthequalityoftheairthey___(breath).
Thereisnopoint______takingFrenchlessonsifyoudontwanttolearnthelanguage.
We______togotothesupermarketbecausewehadplentyoffood.
Theyknewtheyhadto________actiontodealwiththeplaguebeforeitspreadtootherareas.
Thepoliceaskedthemtodescribethe________womanlookedlike.
