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I don't know how to correct.

1. A chunk of uranium the size of a softball can release more energy than a trainload of coal that weighs 3 million times so much.
2. The piano as it is known today represents a long series of experiments extended back to the year 1711, or perhaps even earlier.
3. Education in the United States is overseen by local school districts, which follow regulations mandated by their respective state government.
4. Today’s fashion designers must consider both how much a fabric cost and how good it wears
5. An audience is different from a crowd in that it refers to people who gather for the purpose of listening or observing some proceedings in accordance with a program set in advance.
6. Timothy Shay Arthur did so poor in school but became an avid reader and in the process seriously damaged his eyesight.
7. Yearning for a truly representative art form of the Americas, the art world of the 1920’s looked hopeful to the three popular Mexican mural artists of the day.
8. No matter how cautious snowmobiles are driven, they are capable of damaging the land over which they travel.
9. Elaine Kim’s study creates an insight on the contributions of Asian-American women to the economic and cultural development of the U.S.
10. A possible first step in developing a nonsexist vocabulary with which to discuss about the works of the nineteenth-century writer Elizabeth Gaskell would be to cease referring to her as “Mrs. Gaskell”.
11. An ingenious system for carrying mail, the Pony Express was existing only briefly before the telegraph system made it obsolete.

1.D 2.C 3.D 4.D 5.B 6.A 7.C 8.B 9.A 10.C 11.B
Comments  
as much
extending
governments
how well
listening to
so poorly
looked hopefully
cautiously
an insight into
discuss
in existence
Thanks so much. Mister Micawber

But I'm a little bit confused with the problem#7. Why don't we use "adjective" after looked?

For example, he looks tired.
Students: We have free audio pronunciation exercises.
They have different meanings:

He looked tired after the meeting = his appearance seemed tired; his face was sagging, his eyes reddened, etc.
He looked tiredly at the length of the queue. = He gazed in a tired manner; as if he were tired

...the art world of the 1920’s looked hopeful to the three popular Mexican mural artists of the day -- this means that the mural artists were looking at the art world and felt that it had a hopeful appearance: it seemed a creative environment. BUT, this is not the intended sense of the sentence. Judging from the first clause,

Yearning for a truly representative art form of the Americas, the art world of the 1920’s looked hopefully to the three popular Mexican mural artists of the day -- the art world is yearning and looking in a hopeful manner, with hope in its heart, toward the mural artists who may create this representative art form.
Ohhhhh.... Your explanation is very clear. Thanks so much. [y]
Hai, this is sandeep,
i am taking my toefl exam this month end. so, i am not exposed to the exam much. i have read u are post and the replies u have got are too great from a great professor i think he is. so, can u please tell me whether we should identify the correct answer or should we have to also correct the word which he has given wrong in the sentence.
as as example :-- i am taking u r sentence only ,

A chunk of uranium the size of a softball can release more energy than a trainload of coal that weighs 3 million times so
much.
the answer is D which is underlined so we should just identify that or we should even correct it in the exam ...

Thanking u ......
Byeeeeeeeee
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thank you so much!!