27. Nearly four hundred supermarkets in Beijing are preparing to dim their lights ________ the "Earth Hour 2010" on Saturday night.
________ cold, he covered his blanket, _____ only his arms _____ .
Tom and Jack are both very clever. ________, Tom is _______ Jack.
--- Is that 120? My brother is seriously ill!---Ok. Help is _________ .
I think that ____ very difficult to learn.
When we visited my old family home, memory came __________ back.