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With the help of high technology, more and more substances _________ in the past years.

A．discovered	B．have discovered
C．had been discovered	D．have been discovered

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--Miss Smith is waiting outside. ________ she come in to see you, sir?
---Yes, please show her in. I have got something important to tell her.

A．Shall

B．Will

C．Would

D．Must

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-- How about dinner tonight? It's on me.
-- .

A．You're welcome	B．I'd like to.
C．Well, I'm afraid so.	D．That's all right.

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We were very excited to watch the national flag in the blue sky.

A．risen	B．raise
C．to raise	D．rising

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I know you are very _______ ice cream, but you will be too fat if you eat too much.

A．tired of	B．fond of
C．full of	D．afraid of

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Tom insisted that the boy _______ seriously ill and that the boy _______ to the hospital at once.

A．be; should be sent	B．be; was sent
C．was; be sent	D．was; was sent

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