I. Put questions for underline

  There are often traffic jams in the city centre in the rush hour ( underline: in the rush hour )

⇒ When are there often traffic jams in the city centre?

II. Complete of the following sentence with the words of phrases give

  There / used / be / a / factory / town centre / but / it / move / the /suburbs

⇒ There used to be a factory in the town centre but it was moved to the suburbs. 

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I

There are often traffic jams in the city centre in rush hour

==> When are there often traffic jams in the city centre?

II

There used to be a factory in the town centre but it was moved to the suburbs.