Read the passageand choose the best answer.

The wind controls our planet's weather and climate. But how much do we understand about this complete force (23)________can kill and spread fear. One night of October 15, 1987, the south of England was (24) ________ by strong winds. Gusts of over 130 km/h blew through the region. Nineteen people were killed, £1.5-billion worth of damage was (25) ________ and 19 billion trees were blown down in just a few hours.Although people thought of this as hurricane, the winds of 1987 were only a (26) ________ 7 storm. They remain far better known than much more serious storms of January 25, 1990, when most of Britain was hit by daytime winds of up to 173 km/h. On this occasion, 47 people were killed, even though, unlike in 1987, the weather forecastersissued accurate warnings. Extreme weather events such as these are dramatic reminders of the (27) ________of  the wind. It is one part of the weather that people generally do not give a second thought to, but across the world the wind plays a crucial role in people's lives.

(23)...............

• A. 
  what
• B. 
  when
• C. 
  which
• D. 
  where