Withthehelpofhightechnology,mo

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

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

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I am ashamed, sir, that I wasted the many hours _____ I should have devoted to my major.

A．while

B．as

C．once

D．when

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Turn on the television or open a magazine and you _______ advertisements showing happy families.

A．will often see

B．often see

C．are often seeing

D．have often seen

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―I'm considering returning home. I just can't get used to the food here.
―Take it easy. _______.

A．Storms make trees take deeper roots.	B．East or west, home is best.
C．From small beginning come great things.	D．All things are difficult before they are easy.

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The company guaranteed a call-back policy_______their products have any risk in safety.

A．should

B．might

C．could

D．would

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Can you imagine what difficulty people had this year_______against the severe natural disasters?

A．fighting

B．to fight

C．fought

D．fight

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