It was not until 1920 ________ regular radio broadcasts began.

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It is ________ he said ________ is very important to us.

[　　]

A. what; that

B. that; that

C. all that; what

D. which; that which

_______ you met the Englishman?

[　　]

A. Where it was that

B. Who it was that

C. Whom was it that

D. Where was it that

Who was it ________ called him“Doggy”?

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It is known that it was by Columbus ________ America was what was first called“India”.

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No one would have time to read or listen to an account of everything ________ going on in the world.

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Was ________ Bill ________ played basketball very well ________ helped the blind man across the street?

[　　]

A. this; who; who

B. which; that; that

C. it; who; that

D. that; that; who

When I try to understand ________ that prevents so many Americans from being as happy as one might expect, it seems to me that there are two causes.

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--________ you got in touch with Mr Smith? --Through a friend of mine.

[　　]

A. It was how that

B. How was it

C. How was it that

D. Was it how that

In some parts of London, missing a bus means ________ for another hour.

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