请选出下面各情境中说话得体的一项是

Doyou know whIdon’t care.

The fog was so heavy this morning that drivers could hardly ________ the things just ten meters away from them.

Progress so far has been very good _____, we are sure that the project will be completed on time [ ]

you beento the Great Wall—Perhaps notin my memory ________, it might have been during my early childhood