Many trees and flowers ________ in the last few years and the small city ________ into a big garden.

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A．have been planted; has been turned

B．have been planted; was turned

C．were planted; has been turned

D．planted; turned

Great changes ________ in Guangzhou since 1980, and a lot of big buildings ________.

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A．were taken place; were set up

B．have taken place; have set up

C．have taken place; have been set up

D．have been taken place; have been set up

The policeman said the accident last night ________ careless driving, so much money ________ be paid by the driver.

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The bell________the end of the period rang, ________ our heated discussion.

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They are ________ different sizes, shapes and metals, but they are exactly the same ________.

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Seventy students ________ our class, while our school is ________ forty classes.

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The reason ________ he is late is ________ there was a break-down on the railway.

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When Jack woke up, he was in the hospital, but he didn't know how that had ________.

[　　]

--Catherine, I have cleaned the room for you.

--Thanks. You ________ it. I could manage it myself.

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