____ careless he is!
A. What
B. How
C. So much
D. How much
____ from Beijing to London!
A. How long way it is
B. What a long way is it
C. How long way is it
D. What a long way it is
She was ___ her early twenties when she went abroad.
A. at
B. on
C. of
D: in
During____ century, the world population has reached 6 billion.
A. twenty
B. the twentieth
C. twentieth
D. the twenty