题目

根据句意用所给动词的适当形式填空，必要时可加情态动词。 1．Peter ________（come）here tomorrow，but I'm not quite sure． 2．________people ________（use）money in 100 years? 3．--What were you doing when the UFO took oft? --I ________（watch）． 4．Thank you so much for ________（invite）me． 5．You ________（have）your lunch already，haven't you? 6．I ________（not see）my aunt for a long time 7．If you work hard enough，you'll find a good way ________（learn）English better． 8．--Have you ever been to Qingdao? --Yes．And I ________（s某研究性学习小组设计下列实验方案，验证铁、铜、银三种金属的活动性顺序，每种方案所需试剂如下（反应所得产物可用作试剂进一步反应），其中不可行的方案是（　　）A．铜、硝酸银溶液、氯化亚铁溶液B．银、铜、氯化亚铁溶液C．铁、银、氯化铜溶液D．铁、硝酸银溶液、氯化铜溶液