1 . When I first arrived ________San Francisco,I had a difficult time ________certain aspects of the American way of doing things.

A．at;to understand	B．in;to understand
C．in;understanding	D．at;understanding

2 . There is no doubt ________all this new technology is changing the way ________we work and offering many other ways of working.

A．whether;that	B．that;/
C．if;in which	D．what;that