At college, Barack Obama didn’t know that he the first black president of the United States of America.

A. was to become B. becomes

C. is to become D. became

Tom is indeed a good child; he often helps his parents clean and ________ the bedrooms on Sundays.

A. move B. manage

C. arrange D. serve

You can’t borrow books from the school library _______ you get your student card.

A. before B. if

C. while D. as

In ancient times, people rarely travelled long distances and most farmers only travelled the local market.

A. longer than B. more than

C. as much as D. as far as

This training program can give you a lift at work, ____ increase your income by 40%.

A. as well as B. so long as

C. so much as D. as soon as

For forty years scientists have been (好奇的) about that fish.

He made a __________ (大笔的钱)by selling waste materials.

His dog became his closest ____________(陪伴) during the last years of his life.

She opened the door quietly so as not to d________ the sleeping child.

A society was set up to _______ the endangered animals and plant life from dying out in this area.

A. reserve B. preserve

C. observe D. deserve