1.Mr.Black worked hard in his office.2.I must go to the baker's.There isn't any bread in the kitchen.3.When did he buy his new coat?4.我得了重感冒,我必须卧床。5.我昨天在街上遇到她,她热情的向我打招呼。6.你昨天晚上做作业了吗?7.我们没有苹果了,我要去买一些。8.他昨天和你说什么了?(一定要注意,这一些句子是新概念英语第一册Lesson73-78同步练习册里出现的)