Wewerebusy________(get)thingsreadyforthetrialproductionwhenhephonedus.

已知函数11sinxfxxx，记0limxafx，(I)求a的值 (II)若x0时，fxa与kx是同阶无穷小，求常数k的值.

Herefusedtotelluswhetherhe________(undertake)thejob.

Weregretto________thatitmaynotbepossibletodealwitheveryrequest.

和平赎买的具体方式___________。