Although international travel is usually an (21) __________and pleasant experience, travellers should take steps toensure that their health does not suffer either (22) ______their time _____ the air or ______ their time abroad.Before you go, check with your doctor or local travelclinic (23) ______ injections are necessary for the areas youare travelling (24) _____. Allow sufficient time to have theseinjections before you (25) _______ because they may taketime to become effective. Be sure that the information onhealth is up-to-date. Check on the Internet if you are notsure.Don‘t go to bed late the day (26) _______ you fly.Your body has a natural daily sleep pattern. It takes timeto adjust to a new time zone. There are many different (27)__________ of jet lag: you may not be able to sleep, you maynot want to eat or you may feel sick and tired. You may notbe able to concentrate for some days after you arrive.There are several things you can do to (28) ________ theeffects of jet lag:
－Do your (29) ______ to relax during the flight;－Sleep as much as you can on the flight. Use a mildsleeping pill if necessary;－Drink as much water as you can;－Don‘t drink alcohol and caffeine;－Take mild sleeping pills (30) ______ the first few days inthe new time zone if you need the

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