Question

tkhsre

ここの整序問題が分かりません。教えてください

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4・ Now alot of people have cell phones.                                              (岩手)

: They are useful, but ! saw some people answering their cel phones On the train
this morning.

4: Really? People ( have / use / know / them / to/ how / who ) and where to use tbeme
People                                                                          and where to use them.