题目内容：
SayingGoodbyeMany people were waiting for the train．Some were reading newspapers and some were saying goodbye to their friends．
Doctor Smith,Mr．Lee andMr．Brown were talking so happily that16Then the guard called loudly,"The train is going to leave．17"The three men heard the guard and two of them jumped onto the train quickly before it moved．One was left behind．It was Dr．Smith．He18The guard came to him and said,"Don'tworry．19”“I know．"Dr Smith said,"20 My friends only came to say goodbye to me．" A．But it is my train．
B．they didn't know the train was going to leave．
C．was very excited．
D．Hurry up,please．
E．looked very sad．
F．The next train will come in the minutes．
G．Take your time．
第16题应填____
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