1) The machine isn't working. a) It always acts up after lunch.  b) It always act up after lunch.  2) I understand maths, it always makes sense. a) it adds up.  b) it adds together.  3) My friend's mum had been unwell, so a) I asked before her.  b) I asked after her.  4) We had finished our exams, so I  a) asked my friends out for dinner to celebrate.  b) asked my friends through to a restaurant to celebrate.  5) School finished early today, so  a) I asked my friend over to my house to play computer games.  b) I asked to my friends play computer games.  6) My sister always thinks she is correct.  a) She never backs up in an argument.  b) She never backs down in an argument.  7) The business man was not reliable, and he a) backed up into our deal at the last minute. b) backed out of our deal at the last minute. 8) Our new house is lovely. a) It backs onto the sea.  b) It backs off the sea.  9) You're standing too close to me a) please back off b) please back in 10) How do you know that is true? a) Do you have anything to back in that?  b) Do you have anything to back that up? 

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