1.  During early rehearsals, an actor may forget (his or her, their) lines.

2. The Washington team was opportunistic; (it, they) took advantage of every break.

3. A person needs to see (his or her, their) dentist twice a year.

4.  The committee members put (its, their) signatures on the document.

5.  If any one of the sisters needs a ride, (she, they) can call me.

6.  When someone has been drinking, (he or she, they) may drive poorly.

7.  If the board of directors controls the company, (it, they) may vote for a raise.

8.  Neither the pilot nor the attendants gave (his or her, their) opinion about the mishap.

9.  Each of these companies had (its, their) books audited.

10. Some of the china has lost (its, their) luster.