having some problems with some TOEFL tests!

0Hello Everyone! 02br
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00I took the following tests on TestMagic. Though TestMagic provided very good explanations for their tests but I had problem with the following samples, the explanations were very simple. I was wondering if someone could better explain it for me... 02br
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01font008. Uranium, 01i00____02i00 , is an exceedingly rare and potentially dangerous element. 02font02br
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01font00to found in trace quantities02br
00found in trace quantities00 02font02br
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01font00Same problem again. -ing or Ed? -ing or Ed? -ing or Ed? It never ends... Anyway, Erin Billy says that we need the Ed form here because uranium is the object of the verbal 01i00found02i00. 02font02br
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01font00finding in trace quantities02br
00to be found in trace quantities02font02br
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00-------I really don't get it, why we need FOUND here? what does it have to do with the object? why we can't use finding?02br
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01font003. After her death in 1986 many documentaries 01i00____02i00 Georgia O'Keeffe were produced.02font02br
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01font00related the life and work of02br
00to relate life and work02br
00life and working to relate02br
00relating the life and work of00 02font02br
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01font01i00relating02i00 modifies 01i00documentaries02i00; we can also call this a reduced adjective clause. 02font02br
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00Nor do I get this one. I thought we should use related instead of relating. it sounded better for me!02br
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01font005. The architecture exhibited in the 00 and 01u00conveyed02u00 us an idea of the 01u00prevailing02u00 attitudes of the day 01u00is02u00 important for the historical and cultural value 01u00it represents02u00.02font02br
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01font00conveyed ==> conveying00 02font02br
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01font00The perennial problem: Do I use -ing or -ed? Here we need the -ing form because 01i00architecture02i00 is the subject of the verbal 01i00conveying02i00. 02font02br
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01font00I (Erin Billy) wrote this problem this way because I noticed that many of my students were missing real TOEFL questions (just like 01font00this one) because they were simply matching the Ed form in 01i00conveyed02i00 with the Ed form in 01i00exhibited02i00 and assuming it was correct that way. 02font02font02br
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01font00Nope! Not a good strategy--you'll miss the harder questions if you do that!!02font02br
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01font01font00prevailing02br
00is02br
00it represents 02font02br
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00----I don't understand this one,,, (the architechture exhebited in the empire state building and conveyed)? what is the position of exhebited here? and why ing not ed?02br
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01font006. 01u00In 200102u00 George W. Bush, Jr., 01u00entered02u00 his first year 01u00office02u02br
01u00as President02u00 of the 010200.02font02br
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01font00In 2001 02br
00entered02br
00office ==> of office00 02font02br
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01font00Gotta have this preposition! 02font02br
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01font00as President 02font02br
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00why we gotta have this prepositions?! isn't this something like academic year? or ......02br
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