—All the volunteers were very tired, but of them took a rest.—They were busy looking for the missing people.
---What’s this _____ English? ---It’s an eraser.
Two and four is________.
--- What’s this, Xiao Hong?— It’s _____ orange.
Must we sweep the floor right now? No, you _______. You can do it later.
Excuse me, may I ask you some questions, Jane? OK, _______.