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______ scientists have learned a lot about the universe, there is much we still don't know.

A．Once

B．Since

C．Though

D．Unless

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Last summer holiday, I went back to my hometown, _______ the neighbors and the house _____ I used to be familiar with were gone.

A．only finding; which	B．only found; that
C．to find; whom	D．only to find; that

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----My e-dictionary is nowhere to be found. Who ______ have taken it?
-----Keep looking and you will find it. ________ you have good luck!

A．should; Need

B．should; May

C．could; May

D．could; Need

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The fire caused thousands of pounds' ________of damage.

A．worth

B．price

C．value

D．prize

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It took a long time for the connection between body temperature and illness________.

A．to make

B．to be made

C．making

D．being made

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―The river runs clear.
―We all appreciate the importance the local government has______ the environmental protection.

A．attached to

B．contributed to

C．responded to

D．subscribed to

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