Chapter 1 Basic Structure
1. Subject
1.1 Studies show that ______ are easily passed from one person to another by failure to wash hands frequently.
1.2 My brother started working in the pizza business after ______ graduated from college.
1.3 The announce of the captain is that the airplane would be arriving in twenty minutes.

 (A) Infect    (B) infections   
 (C) infectious    (D) infecting