1.[Melting] glaciers may [account the] rise [in sea level] that [has taken place] honing this century.
2.Anthropologist jane Goodall [has contributed] a [wealth information]concerning primate behavior [through] her [studies] of chimpanzees.
3.The [discovery] of gold in 1848 [transformed] San Francisco suddenly from a [quiet] portsintosone of the world's richest and most famous [city].
4.Allan Pinkerton,[founder] of [the famous] detective agency that bears [him] name,directed a Civil War espionage system [behind] Confederate lines.
5.The city of Kalamazoo, Michigan,derives its name from a Native American word....."bubbling springs."
C.that is meant
6.Salt is manufactured in quantities that exceed those of most,.......,other commercial chemicals.
A.of an not
B.not if an are
C.are not an
D.if not an
7.Contemporary film directors,some of [them] write the scripts for,act in,and [even] produce their own [motion] pictures, are [thereby assuming] ever more control of their art.
8.Petroleum [it is] composed [of] a complex[mixture] of hydrogen and [carbon].
9.The air inside a house or office building often has higher concentrations of contaminants ....... heavily polluted outside air.
C.as some that are
10.Emily Dickinson's garden was a place...... great inspiration for her poems.
A.that she drew
B.by drawing her
C.from which she drew
D.drawn from which
11.In the United States [among] 60 percent [of the space] on the pages of newspapers [is reserved] for [advertising].
12.Scientists believe that by [altering] the genetic composition of plants it is possible to develop specimens that are [resisting] to [disease] and have [increased] food value.
13.The American anarchist Emma goldman infused her spirited lectures, [publishes],and demonstration [with a] passionate [belief] in the freedom of [the] individual.
14.[Being] the biggest expanse of brackish water [in the] world,the Baltic Sea [is of] special [interesting] to scientists.
15.While studying the [chemistry] [of human body],Dr.Rosalyn Yalow won a Nobel Prize for the research she [conducted on] the [role of] hormones.