They ________ extensive and possibly dangerous actual flight training.
A、undertakeB
句意：他们经历了大量的并且可能是危险的实际飞行训练。
_______thefirstlanguageisusedintheteachingofthesecondlanguageintheGrammar-TranslationMethod.
ltisoursincerehopethatyouwilldirectyourefforts__thepromotionofthisnewproductinyourmarket__ourmutualbenefit.
____yourinformation,wehavereceivedacrowdofenquiriesfrombuyersinotherdirections.()
Sincethepremiumvarieswiththescopeof____extrapremiumisforbuyer'saccount,shouldadditionalsiskecovered?()
We___youforthespecialofferyousendus.()
