Match Wits With Our Word Wizards

(Illustrated version of Word Wizards)

To Use Its or It's--
That Is the Question

Pick the correct word from each set

• The construction of figure 1 is approximate because (its, it's, its' ) purpose is to identify activities, not to classify efforts precisely.
• Here (its, it's, its' ) important to consider (its, it's, its' ) marginal cost.
• Essentially, the crew had to choose between allowing the aircraft to be governed by (its, it's , its' ) automatic pilot or to fly it manually.
• A representative of the design group was assigned to define the input and output requirements for the support program and verify (its, it's, its' ) operation.
• The helix slow-wave circuit remains the mainstay of the traveling-wave tube (TWT) industry because (its, it's, its' ) stable.
• The dynamics of a charged particle in electromagnetic fields are completely determined by (its, it's, its' ) specific charge to mass ratio q/m.
• The radial component of magnetic flux density is often neglected but (its, it's, its' ) significant relative to the longitudinal component.

For an explanation of its, it's, and its', see Quirks of English.