--I didn’t get time to ask you why you looked so upset at the party. -- Oh, a lot of unexpected things _____.
His sudden look of fear made _____ clear that he had something to do with the matter.
Teenagers are warned to be careful when making friends online, because when you can’t see a person, they could be _______.
He hurried to the station only ____ that the train had left.
Lily’s mobile phone was left in a taxi accidentally, never______________ again.
A new teachnique ____the yields as a whole increased by about 30 percent.