I don’t have any__________in learning English grammar,but l otten make spelling mis__________takes.
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举一反三
【单选题】If two theories are equal (to) their ability to account (for) a body of data, the theory that (does so) with the smaller number of assumptions is (to be preferred).
【单选题】Two ponies of equal mass are initially at diametrically opposite points on the rim of a large horizontal turntable that is turning freely on a frictionless, vertical axle through its center. The ponie...