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。
Pleaseseetoitthatthegoodsweorderedareshippedassoonasthecoveringletterofcredit____you.()
PleasemakesurethatthestipulationsintheL/Care______exactaccordanee___thetermsoftheSalesContract.
Weshallcertainlycontactyou,assoonasweare____apositiontoentertainnewbusinessinyourdistrict.
Thenewspaperwillhavetoclosedownifitcannotincreaseits________considerably.
Overemphasis on translation will usually make the learner________the first language in the learning of the second language.
