完成句子
11．He was so excited that l couldn't make him   _____    (平静下来)．
12. We are all  _________ (相处得很好) each other in our class．
13．She    _____ (为．．．．担忧)her son's future．
14．There has been  ________ (一系列)cars accidents at the crossing．
15．Filling the blanks  ________ (根据)what I have said．