根据汉语意思完成句子,每空一词。 1.当心!了。 ____ ____!The train is coming. 2.吉姆经常在上课时向窗外看。 Jim often____ ____ ____ the window when he is in class. 3.半夜,外面传来了奇怪的声音。 _____ ____ ____ the night, there was a strange sound. 4.在公园野餐后,我们应该捡起垃圾。 We should____ ____ ____ ____after we have a picnic in the park. 5.新年聚会结束了,让我们收拾教室吧。 The New Year's party is over. Let's____ ____the classroom. 6.女孩伸出一只手去摘漂亮的花。 The girl____ _____ a hand for the beautiful flower. 7.昨天晚上他太伤心了以至于不能人睡。 Last night, he was too sad to____ _____.