21. The manager received a number of ___ from customers about the lack of desserts after the meals (complain) 22. The students have studied the rock ___ in their recent geography lesson. (form) 23. I regret to ___ you that you are not allowed to enter this site. (information) 24. Mark has joined this ___ club for about three years. (photo) 25. Do you have any ____ about arriving at the airport in time now? We are 15-minute late. (suggest) Làm ơn giúp mk vs ạ