The word as in “as they feed on microorganisms” can be substituted by 
The best way to complete the sentence “Aquaculture will add to wild seafood, and make it _______ and accessible to all” is 
The best negative form of the sentence “Aquaculture business provides tax and royalty revenue to local governments” is 
Based on text CB1A5AAA, judge the following items.
The words “unaware” (l.12) and “wary” (l.16) are related in terms of meaning, being both connected to the notion of caution and attention.
Based on text CB1A5BBB, judge the following items.
In the fragment “on becoming director of the American National Security Agency” (l. 9 and 10), the preposition “on” refers to a period when the action is taking place.
Based on text CB1A5BBB, judge the following items.
In line 31, the connector “Hence” introduces a logical conclusion.
In the fragment “Moreover, recent cyber attacks have increased awareness of potential threats facing the industry” (lines 52-53), Moreover can be replaced, without change in meaning, by 
According to the text CB5A1AAA, judge the next items.
In the excerpts “they help to assure” (l. 4 and 5) and “so that they can lead a dignified life” (l.6), the pronoun “they” refers to “basic human rights” (l.4).
The word huge in “that would be huge savings” (paragraph 1) can be substituted by the word 
The modal verb should in “we should use all these great ways” (paragraph 6) indicates that the author wants to 