　　 when you are traveling.

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in which what when where

is one time zone is divided into five time zones is divided into twenty-four time zones cannot be crossed in five days

tourist guide is necessary when you are traveling in this big city. you might lose your way. A. Therefore However Moreover Otherwise

will complete; complete will be completed; is completed will be completed; will be completed is completed; will be completed

in which what when where

in which what when where

the beginning of any new time zone any point where time changes by one hour the point where a new day starts any time zone in the Pacific Ocean

不填;a a; a a; the a; 不填

in which what when where

ahead one hour in each new time zone ahead one hour for the whole trip back one hour in each new time zone back one hour for the whole trip

no day really has twenty-four hours the earth is divided into time zones time zones are not all the same size no one knows where time zones begin

unless as if when

–You’re right. I like ______ when people are friendly and helpful.A. that it one them

one day twenty-five hours one hour twenty-three hours

where which when that

substitute selection preference alternative

X，a a，a a，the a，x