This is great fun. Set up the classroom so there are various objects visible, e.g. a book, a school bag, a chair, pens, pencils, an eraser, a stapler, a calculator, etc. - basically whatever vocab you have pre-taught. Give the students a minute to look at the objects. Students will close their eyes and one object will be removed (perhaps also shuffle the other objects for more of a challenge). Students try to guess what object was removed.