I tried knocking at the front door but nobody ___it

I tried knocking at the front door but nobody ___it I tried to wake up my life by knocking at the door,but she was fast a______. i seem to hear someone knocking at the door,knocking为什么要加ing I’ve been knocking at the door.I don’t think anybody is in.翻译下 I heard someone _____(knock /knocking) at the door just now .横线上应填什么?为什么 who is knocking at the door?it is ()me还是i呢?求理由 Listen!I hear someone knocking at the door.Listen!_____ ______ a knock on the door. i cant even spell XD at least you tried 14.While _____ the food with the microwave oven,I heard someone ______ at the door.A.heated; knocking B.heating; knocking C.heat; knocking D.be heated; knocks I_(listen)to music in my bedroom at that time ,so I __(not notice) anybody knocking at the door. i saw a car___a big tree yesterdayA:knock at B:knocked at C:knocking at D:to konck at应该选哪个?为什么? 请帮我划分一下这个句子的结构,I seem to hear someone knocking at the door. I heard someone ____(knocking/knocked)at the door just now.那用knocked也满足hear加从句呀？ who is knocking at the door?i suppose------must be bob.A.the one B.it C.who D.he I seem to hear someone knocking at the door,系动词seem后面加动词的时候也要用不定式吗? I hear someone knocking at the door.Please go and see who ____is.A.it B.he? 请看下面的句子：Who is knocking at the door?I think (it) is Li Lei.为什么要用it? 一道关于try to do和try doing用法的英语题!No body answer the front door.So he tried ____ at the back door.A.to knock B.knockC.knocked D.knocking应该选择哪个?