They________extensiveandpossiblydangerousactualflighttraining.
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。
I don ’t think the charge for overhauling the equipment is excessive in _______ to its size.
Itisdifficulttounderstandthiskindof_______calculation.
Ourpaymentterms(付款方式)are___,irrevocableletterofcreditforthefullinvoicevalue.()
In the Grammar-Translation Method, understanding and memorization of_____________were regarded as important means of developing mentality.
—— We have to stop talking here outside. Listen, _______! —— Hurry up, or we’ll be late
