Whatswrongwithyourforehead（前额）

What's wrong with your forehead（前额）？

I knocked my head on the tree while I _____my dog．（　　）

A．walkedB．was walking

C．has walkedD．am walking

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______ October 1，we will celebrate the seventieth birthday of the People's Republic of China．（　　）

A．OnB．InC．At

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A．otherB．anotherC．the other

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A．how good it isB．how good is it

C．what good it is

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A．whoB．whichC．what

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A．the most difficultB．the least difficult

C．the less difficult

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