1、Both his parents look sad . Maybe they ______what's happened to him .A. knew B. have known C. must know D. will know2. Kate's never seen Chinese films, ____ ? A. hasn't she B. has she C. isn't she D. is she3. He has _______ been to Shanghai , has he ?A.already B.never C.ever D. still4.-Our country ______ a lot so far .-Yes . I hope it will be even ______ .A. has changed ; well B. changed ; good C. has changed ; better D. changed ; better5.We ______ Xiao Li since she was a little girl .A. know B. had known C. have known D. knew