志愿者们正在努力地为俄罗斯世界杯提供更好的服务．（ make）
The volunteers to provide Russia World Cup with better service．
当我们赶到书店时，他们已经卖光了《哈利•波特》这本书．（sell）
By the time we arrived at the bookstore， they Harry Potter．
你应该学会礼貌地拒绝别人的邀请．（turn）
You are supposed to learn others' invitation politely．
阅读对话，根据横线后所给标点符号的提示，在横线上填写适当的句子，使对话完整．
Larry：What beautiful pictures!
Mike：No，they are not pictures．They are stamps．
Larry：Stamps？ （1） ？
Mike：They're used for posting letters．
Larry：（2） ？
Mike：I've got more than 700of them．
Larry：How long have you been collecting them？
Mike：I've been collecting them since I was five years old．
Larry：How are you going to do that？
Mike：I'm going to study art really hard and go to an art college．
Larry：I hope your dream can come true．
Mike：（3） ．
Lucy looks thin but is in fact．（精力充沛）