Come()It's time for class A:in B：up C：on The teacher‘s offic

选C 快点!上课的时间到了
选C 老师的办公室在二楼
再问： How many trees are there？A：NO，theyaren’t B：one C：on Now let me draw（） on it A：some thing B：There are eihht C：somethings -re they dogs（）A：They are cats B:Ther five dogs C：Yes，they are
再答： How many trees are there？A：NO，theyaren’t B：one C：on 选BNow let me draw（） on it A：some thing B：There are eihht C：somethings 选C-re they dogs（）A：They are cats B:Ther five dogs C：Yes，they are选C