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The bag is filled with books．(改为同义句)

The bag ________　________　________ books．

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If there is no air, we can't live．(改为同义句)

________ air, we can't live．

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It's very hot．Don't close the door．(改为同义句)

It's very hot．Please ________ the door ________．

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Elephants walk on tiptoe．(对划线部分提问)

________________________________

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It takes about three days to travel from the Earth to the Moon by rocket．(对划线部分提问)

________________________________

________ elephant is ________ useful animal．

A．

An; a

B．

The; an

C．

An; an

D．

The; a

The room is dirty．You must keep it ________．

A．

to clean

B．

clean

C．

cleaning

D．

cleaned

He went out without a raincoat ________ an umbrella．

A．

and

B．

but

C．

or

D．

with

Fish sleep ________ their eyes ________．

A．

with; opened

B．

without; close

C．

with; open

D．

without; open

There is ________ UFO in the sky．

A．

an

B．

a

C．

/

D．

some