When Jim’s mother came in, he _______ his homework.A. is doingB. has doneC. was doing
当你向别人打听某事时,你应该说:________。
找出都是三笔完成的一组字母:_______
下列字母________是元音字母,26个字母中第16个字母是________。
—Your pencil case is very nice. —________.
______ your teacher for your pen.