—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. 

(2013·潍坊一模)Ang Lee's new film Life of Pi is based on a fantasy adventure novel by Yann Martel ________ in 2001.

----Can you think of another good idea? ----This is the best approach I can imagine ________ the work ahead of schedule.

Seeing the road _________ with snow and cyclists falling down here and there, we decided to walk to our office.

Previously ______ at a fast food restaurant, the Smiths were dissatisfied with the unhealthy meals they served there.