Firm Preston $ Associates was______the contract to design the world's new tallest building.
A．award
B．awards
C．awarded
D．awarding

We are delighted to establish business relationship with you.
A．be established
B．establishing
C．be establishing
D．have established

Mr. Salt wants to create anti-cancer foods by ______.
A．copying tissues from wild plants that take up selenium naturally into crop plants
B．copying genes that causes the plants to take up selenium from the soil
C．moving selenium from the tissues of wild plants into crop plants
D．moving genes from wild plants that take up selenium naturally into crop plants

Damage from the mortgage crisis hurt lender Casita, which______big first quarter losses.
A．knew
B．posted
C．presented
D．displayed

We have been told that under no circumstances we can use the telephone in the office for personal affairs.
A．did we use
B．may we use
C．we may use
D．we could use

Your Math instructor would have been happy to give you a make-up examination, had you gone and explained that your parents were ill at the time.
A．如果你向你的数学老师解释你父母那时生病了，他会乐于给你一次补考机会的。
B．只要你向你的数学老师解释了你父母那时生病的原因，他会乐于给你一次补考机会的。
C．你的数学老师听到你父母那时生病的情况后，他会乐于给你一次补课的机会。
D．你的数学老师会高兴你把你父母那时生病的情况告诉他，他会给你一次补课的机会。