Hello!
Please, I'd like an explanation. Yesterday I sent two messages with similar set of three exercises each. The first ones were about questions and answers and the last was about to complete with the appropriate preposition/particle, in which I asked that my sentences were just checked, to see if there were any mistakes.
Well, since then I have been waiting without success for the help and one of the messages
simply disappeared! Why? In spite of I sent similar sets, the sentences were completely different in each one of the messages.
I'm a little bit disappointed because I had the work to type everything, but all seemed to be in vain.

Best wishes,
Adonis