—I do believe the scientific explanation that when a tomb is opened, the fresh air disturbs the viruses inside it. What about you?

   —So do I. If _______ in, the disturbed viruses may cause illness or even death.

       A. breathing                       B. breathed                        C. being breathed             D. to breathe

---I do believe the scientific explanation that when a tomb is opened, the fresh air disturbs the viruses inside it. What about you?
---So do I. If ______ in, the disturbed viruses may cause illness or even death.

1. A.
   breathing
2. B.
   breathed
3. C.
   being breathed
4. D.
   to breathe

—I do believe the scientific explanation that when a tomb is opened, the fresh air disturbs the viruses inside it. What about you?

   —So do I. If _______ in, the disturbed viruses may cause illness or even death.

      A. breathing                 B. breathed                   C. being breathed          D. to breathe

—I do believe the scientific explanation that when a tomb is opened, the fresh air disturbs

the viruses inside it. What about you?

   —So do I. If _______ in, the disturbed viruses can result in illness or even death.

      A. breathing                 B. breathed                   C. being breathed          D. to breathe

—I do believe the scientific explanation that when a tomb is opened, the fresh air disturbs the viruses inside it. What about you?
—So do I. If _______ in, the disturbed viruses may cause illness or even death.