The construction of the gym caused much noise, it difficult for people nearby to sleep.
Some friends tried to settle the quarrel between Mr. and Mrs. Brown without hurting the feeling of ______, but failed .
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.