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With the help of high technology, many new substances（物质）______in the past years.

A．discovered

B．have discovered

C．had been discovered

D．have been discovered

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_____ thirty minutes after a meal is better for your health than immediate exercise.

A．Walk	B．Having walked
C．Walking	D．Walked

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All these problems will be discussed at the meeting ______ next Tuesday.

A．held

B．being held

C．to hold

D．to be held

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To my great ______, grandmother’s illness proved not to be as serious as we had feared.

A．anxiety

B．relief

C．sorrow

D．curiosity

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What a mess I have made! How I wish I ______ to paint the walls of the house.

A．didn’t attempt	B．haven’t attempted
C．wouldn’t have attempted	D．hadn’t attempted

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It was at the Grand Hotel _______ the suspect was caught, _____ was quite beyond the expectation of the police.

A．that; that	B．where; that
C．where; which	D．that; which

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