15. Listen! ________ he singing in the bathroom? A. Does B. Is C. Do D. Are 16. We ________ out different fire trucks. A. are checking B. checking C. is checking D. are check 17. We are visiting a milk farm to see how they ________ milk, cheese and butter. A. make B. do C. play D. ride 18. The film is very ________ and we can’t see all of it. A. wonderful B. easy C. exciting D. boring 19. The summer camp is for students ________ between 10 and 15. A. age B. aged C. aging D. ages 20. They are moving ________ a new apartment ________ the city center soon. They don't like living in the countryside. A. at – at B. from – in C. to – in D. to – from