请问下面这些短语怎么造句呀?1)in the case of 2)from time to time 3)on the one handwho can tell me thankyou very much!

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请问下面这些短语怎么造句呀?1)in the case of 2)from time to time 3)on the one hand
who can tell me thankyou very much!

1 we shoud bring some medicine for our trip in case of emergency.
2 she takes a trip from time to time.
3 using internet is a good thing,but on the other hand,we may spend too much time on it.

from time to time有时,相当于sometimes
in case of 以防万一