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- He kept a straight face and remained speechless .
- Frank kept a straight face when kate made a ridiculous mistake .
- I kept a straight face as long as i could , but i finally had to crack up .
- He has such a strange voice that it is difficult to keep a straight face when he is talking .
- With a straight face speer appointed ley on the spot "commissioner of death ray" .
- a serious facial expression giving no evidence of interest or amusement