Barack Obama, _________ African America, was elected as _________ 56^th President of the United states．

/; the

/;/

an; the

an;/

This process has not only laid a solid foundation for China to develop into the future, but also _________ the prosperity(繁荣)of Asian economy and the world economy．

depended on

contributed to

approved of

sweep up

Keep on trying! _________ practice is the groundwork for success in playing the piano．

Instant

Constant

Eager

Demanding

Geologically Diaoyu Islands are _________ Taiwan Island．The waters between the islands and Taiwan are only 100 to 150 meters deep．

attached to

divided into

separated from

cut off

The lecture was going well until the projector(幻灯机)_________ and put the professor off his stride．

broke down

broke up

broke away

broke off

However, _________ the technological difficulties of preparation, this material affords a further wide field of application(用途)．

rather than

rather too

apart from

apart with

Anger and hatred boiled within her, but she forced herself to _________ the smiling face that people had always seen．

preserve

handle

infect

fold

Whenever they were busy with their own business, Sam, feeling _________, would go out for a walk or a cigarette．

kept off

cut off

left out

at ease

The audience rose, and loud cheers greeted the _________ of this speech．

ease

rank

outbreak

conclusion

Once we lose the farm, the _________ of poverty(贫困)will be sure．

statement

admission

approach

occupation