1 . The heavy fog in London made _________deep impression on us, which was sometimes so heavy that we lost _________sight of everything around us.

A．a; the	B．a; 不填
C．the; the	D．the; 不填

2 . As _______ unemployment is very high at the moment, it’s very difficult for people to find _______ work.

A．the, 不填

B．不填，不填

C．the, a

D．an, the