If I ______ in your place ， I wouldn ‘t trouble him.
A
本句是对现在的虚拟，所以条件状语从句用过去时。同时在虚拟语气中，一般不用was而一律用were，所以答案是A。
Whentheshiplostitsenginepower,thecrewfoundthemselvesatthe_________ofthewind.
Therediscoveryofthisspeciesofbirdsisoneofthemost___(ordinary)scientificfindingsinrecentyears.
Ifyouhavedifficultylocatingaparticularbook，pleaseaskourlibrariansfor___(assist).
BeforetheSmithsmovedtoNewYork,theylivedinaquiet___(neighbor)ofBoston.
Thetwinsaresoalikethatitsalmost___(possible)totellthemapart.