833.After his grandfather retired from office, he _______ fishing for a while，but he soon lost interest.

A.came up

B.turned up

C.kept up

D.took up

834.Thousands of foreigners were _____ to the Shanghai World Expo the day it opened.

A.attended

B.attained

C.attracted

D.attached

833.答案是D;

此题表示“从事…活动”，故选D项，其他不符合意思。

834.答案是C;

attend出席;attain获得;attach 使附属，使依附。根据语境，选C。句意:上海世博会开幕当天就吸引了成千上万的外宾。