Allow apostrophes in 'type answer' questions

There is a error that pops up when you try to use an apostrophe for an accepted typed answer. As an ESL teacher, this is pretty frustrating because there are often target phrases I am trying to have my students work on. Instead of them being able to put in the phrases that we have been learning, I have to try to get them to type out the contractions instead, which can confuse them when they are in the middle of playing, trying to be fast.