591.Director,Jack is ill,so he can't be here.

Then we'll have no choice but to give the performance ________ him.

A.except for

B.apart from

C.except

D.without

592.A wide range of postcards and other souvenirs are _____ sale in the visitors'center.

A.on

B.at

C.in

D.for

591.答案是D;

根据上文Jack is ill,so he can't be here暗示，只好在没有他的情况下表演节目。

592.答案是A;

on sale在上市，在（廉价）销售for sale待售。