1. encounter: meet or be faced by (something bad, esp. a danger or a difficulty)
　Examples:
　　The plane encountered a storm over the Rockies.
　　They encountered little resistance to the plan.

2. infect: fill with disease, germs; give disease to (a person)
　Examples:
　　This meat is infected because of the hot weather.
　　The flu virus infected almost the entire class.

3. transmit: send or pass from one person, place or thing to another
　Examples:
　　The material was transmitted by satellite throughout the world.
　　This kind of disease sometimes transmits to humans.

4. clean up: clean thoroughly
　Examples:
　　IT staff is the very people to clean up the viruses.
　　It is your turn to clean (the bedroom) up.

5. in place: in the right or proper place
　Examples:
　　The books were in place on the shelves.
　　He nodded approvingly, his wide grin still in place.

6. ensure: make (something certain) to happen
　Examples:
　　He would, when in office, ensure that all secret data be made public.
　　His industry and ability will ensure his success.

7. adequate: enough for the purpose
　Examples:
　　What should be done to assure adequate supplies of energy?
　　There was adequate rain and snow last winter.

8. detect: find out; notice
　Examples:
　　Small quantities of poison were detected in the dead man's stomach.
　　I seemed to detect some anger in his voice.

9. update: make more modern or up-to-date
　Examples:
　　The information will need updating from time to time.
　　The speech had been corrected and updated after the last-minute reports from abroad.

10. identify: prove or show who or what somebody is or something is
　Examples:
　　Could you identify your umbrella among a hundred others?
　　The light was too dim for me to identify her.

11. set in: begin and (probably) continue
　Examples:
　　Fortunately the wound was treated before infection could set in.
　　I must try and get my garden tidied up before the bad weather sets in.

12. perceive: become aware of, esp. through the eyes or the mind
　Examples:
　　On entering his house, we at once perceived him to be a man of taste.
　　She gradually perceived that her parents had been right.

13. in the first place: at an earlier, more appropriate time
　Examples:
　　Why didn't you tell us that in the first place?
　　Nobody can remember what was agreed in the first place.

14. at risk: in danger
　Examples:
　　The disease is spreading, and all children under 5 are at risk.
　　The economy still fell further, putting more jobs at risk.

15. conflict: disagreement; opposition
　Examples:
　　They tried to stir up conflicts between us.
　　No one expected this to be the last conflict between the two countries.