Вставить предлоги if you are going a shopping centre, make sure you have already decided which shops you want to visit. this will help to cut the time you have to spend your shopping trip as well as keeping you wandering around window shopping. if possible try to do your shopping weekdays, or if you have to do it the weekend, go early the morning to avoid the crowds.

If you are going .to.. a shopping centre, make sure you have already decided which shops you want to visit. This will help to cut down on ... the time you have to spend on
your shopping trip as well as keeping you ..back. wandering around window shopping.
If possible try to do your shopping ..on. weekdays, or if you have to do it ..at.
the weekend, go early .in.. the morning to avoid the crowds.