______ lucky we are to have so many responsible teachers!
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What
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How
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What a
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How a
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—      useful suggestion he offered to us!—You’re right. It was of great     . 
#66424
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How, value
B
What, value
C
What a, value
D
What a, valuable
 __________from Beijing to London!
#67337
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How long way it is
B
What a long way it is
C
How long way is it
D
What a long way is it
        useful the advice you offer me is!
#66138
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How
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How a
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What
D
What a