Soundtravelsairaspeedofabout34

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Sound travels ______ air ______ a speed of about 340 metres per second.

A．over; in

B．through; at

C．by; at

D．through; over

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I think _______ boy is not serious enough.

A．a eighteen-year old	B．an eighteen-years-old
C．a eighteen years old	D．an eighteen-year-old

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If I______ you, I would take a small present..

A．am

B．was

C．were

D．are

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This notebookLucy’s. Look, her name is on the book cover.

A．must be	B．might be
C．can’t be	D．mustn’t be

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I mustn’t give up __________ English easily.

A．to study

B．studying

C．studied

D．study

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-- Whose book is this?
-- It must .

A．be Carla	B．belong to Carla’ s
C．belong to Carla	D．is Carla’ s

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