题目

用所给词的适当形式填空 1.Those_________(watch)  are under the desk. 2.________(Gina) book is on the bed. 3.Are they your________(friend)? 4.Please call______(I) Mary. 5.My ________(parent) love me very much. 答案：1.Watches 2.Gina’s 3. friends 4. me 5. parents抛物线y=x2-4x-4的顶点坐标是________．