how,这里now 可以视作插入语或时间状语强调的作用.
Mum shows how to make a hamburger now.Mum shows ______ how to make a hamburger.A.he B.HimC.hisD.hinselfThere're _ in the fridge.A.5 carton of milkB.one can of tunaC.2 boxes of tomatoes pasteD.6 slice of cheese