Read the followingpassage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks.

You can make life more difficult for thieves by carrying your wallet in an inside pocket instead of a back pocket. But make sure that you still have it if someone bumps into you in a (21)______. Most pickpockets are very skillful. Never let your handbag out of your sight. On public transport, take hold of it. You are also (22)______ to take traveler’s cheque rather than cash when you go abroad, and to use cash dispensers which are onmain streets, or are well lit at night.

A quarter of all crimes are car thefts or thefts of things (23)______ cars, like radios and cassettes players. If your car is stolen, you may not get it back. One in four are never found, and even (24)______ it is, it may be badly damaged. Always lock all doors and windows, and think about fitting a car alarm too. If you are buying a new radio/cassettes player, it is worthwhile choosing one that is security-coded or removable by the driver. These precautions will help to put(25)______ thieves.

The passage says that about five hundred volcanoes_____.