Sat Grammar: Common Questions Study Guide Graded A+

Hopkins had no idea what was causing the phenomenon, but he grew fascinated by the daily atmospheric displays, tracking ____ changing appearances over the course of that winter. a. its b. his c. their d. there {Ans: c. their Pronouns must match their antecedents (the thing they stand for) in number, whether singular (one) or plural (more than one). In this sentence, the "changing appearances" are of the "atmospheric displays." Because the "displays" is plural, the plural pronoun "their" is used.}That's an experiment you don't want to ____ would potentially wipe Florida off the map. a. run. That's an experiment that b. run, and such an experiment c. run because it d. run. That experiment {Ans: c. run because it In general, use the fewest words possible to say the same thing, and don't split up ideas that are closely connected. That the experiment could "wipe Florida off the map" is the reason "you don't want to run" it, so "because" is appropriate. Since the "experiment" is the same in both sentences, replace "experiment" with "it" to avoid unneeded repetition.}The ____ the period preceding the Cambrian, was an era of soft-bodied and frond-like creatures. a. Ediacaran, this is