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My brother ________ while he ________ his bicycle and hurt himself.

[　　]

When ________ with practice, theory becomes easier to learn.

[　　]

I want to know if she ________ letters to me in two months. If she ________ to me, I'll read it to you.

[　　]

They have no idea at all ________.

[　　]

A．where he has gone

B．which place he has gone

C．where did he go

D．where has he gone

________ I need is a good rest.

[　　]

No one can be sure ________ in a million years.

[　　]

A．what man will look like

B．what will man look like

C．man will look like what

D．what look will man like

Excuse me, could you tell me ________?

[　　]

A．who is that gentleman

B．whom was that gentleman

C．who that gentleman is

D．whom that gentleman was

Ask him how much ________.

[　　]

You can take ________ room you prefer.

[　　]

Tom killed the cat. I'll ask him why ________.

[　　]