For Questions 16 through 20, select the two answer choices that, when used to complete the sentence, fit the meaning of the sentence as a whole and produce completed sentences that are alike in meaning.

填空题 The problem with activists is that far too often they merely the protection of various ecosystems, instead of taking a lead role in their management.
A. circumvent
B. abridge
C. diversify
D. advocate
E. abhor
F. support

填空题 When practicing with a bow and arrow, it is 1 to be aware of both the velocity and the trajectory of one"s arrows if one wishes to hit the target.
A. irrelevant
B. necessary
C. conventional
D. prudent
E. detrimental
F. insightful

填空题 As we traveled to college for the first time, the family car was 1 with books, clothing, appliances, and other necessities.
A. keen
B. indigent
C. barren
D. pallid
E. laden
F. overflowing

填空题 The 1 of sediment in the river caused concern among environmentalists and industrialists alike; the water levels in the river were being reduced almost daily.
A. accretion
B. disposal
C. depletion
D. alienation
E. ethnology
F. accumulation

填空题 Running a marathon is an 1 task, taking months of both physical and mental preparation and training before actually running a grueling 26.2 miles.
A. arduous
B. ambiguous
C. involuntary
D. eloquent
E. overt
F. ambitious