完成句子
①Hurry up! It looks as if the train_____________________________. (陈述语气)
快点！看起来火车要开了。
②A young couple in a boat were eating, talking and laughing loudly as if they____________(be) the only people in the world.
一对年轻夫妇坐在船上吃着东西，说着话，大笑着，好像他们是这世界上仅有的人。
③Tom raised his right hand as if_____________________________(say) something.
汤姆举起右手好像要说什么。