am is are was were

am is are was were
题目：1.___you a student? ---NO, 2.I____not____he from China3.You ___my good fridnd.4.Jim and I ____in zhe teachers office a moment ago. 5.Were_____his football just now? 6.I______ a student some years ago but I _______ a teacher now. 7.The CDs_____on the bookcase yesterday morning.(照上面所给的单词来填） 速度 到9点就下了 答对给高分!