--- _________ it is to be a host! --- I agree. 
#65802
A
What a great fun
B
How great fun
C
What great fun
D
How great a fun
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--          weather it is! Let's go out and have a walk.-- I'd love to.
#66589
A
How a fine
B
How fine
C
What fine
D
What a fine
   exciting sport it is to climb the mountains!
#66725
A
How
B
How an
C
What a
D
What an
______it is to jump into the river to swim in summer!
#67041
A
What a fun
B
What fun
C
How fun
D
How funny
------_________useful advice he gave me! _________kind he is!
#66965
A
What, How
B
How, What
C
What a, How
D
What an, How