A.take good care ofB.take the place ofC.catch up withD.come up with【8】A.itB.thisC.theseD.them【9】A.wait forB.send forC.join inD.hand in【10】A.simpleB.crazyC.importantD.fresh 免费查看参考答案及解析 题目: Listen! The birds are ___ (sing) in the tree. 免费查看参考答案...