1. You could use 'in'. In fact, there are a number of prepositions that could go in this gap. You could use 'of', 'in' or 'with'. You could even have no preposition at all. If this is a test, it's a bad one, because there are several possible answers. 2. You can't use 'experience' as a countable noun here. In this sense, 'I have experience' is similar to 'I have knowledge' or 'I have had practice', and it's an uncountable noun - so it has to be singular. You can only say 'experiences' when you are using the word in its countable sense, which has a different meaning. An experience is a single event, or something which has happened to you e.g. 'I had many interesting experiences when I was travelling in Africa.' NB Note that the word " can't " always needs an apostrophe.

Thank you so much! You said we use of when sth done to me. What does it mean to say i have lots of experiences in cooking and cleaning? Cooking and cleaning done to me?:D Regarding to your description about "in" i found that its true to use "in" in the blank space so why answer sheat said its not? Should we always use "experience in", and "experience"s" of" together? cause the in first one both of them are sth in general that you have done , in the second one both of them are sth happend to you.

Daniel ... I think this would be a good guide ... 1) use 'in' when it is something "general" where YOU have done something i.e. you have lots experience in something - I HAVE LOTS OF EXPERIENCE IN LANGUAGE LEARNING, 2) use 'of' when it is something DONE TO YOU - I HAVE LOTS OF EXPERIENCE OF BEING HUNGRY AS A CHILD 3) use 'experience' (singular) when you mean "A SKILL in general" I HAVE LOTS OF EXPERIENCE IN LANGUAGE LEARNING ... use 'experiences' to describe things that have happened TO YOU, they are specific things and may not be related to each other e.g. I WENT TO EUROPE LAST YEAR AND HAD LOTS OF GREAT EXPERIENCES. Hope this helps Len

About the first part of the question In for a proposition. It's not a place so you put (in) ☺️