1. I found it very difficult to keep a straight face .

2. It was very difficult to keep a straight face.

3. How can you say that and keep a straight face?

4. I keep a straight face and the composure of a chemist dispensing a prescription.

5. I try and keep a straight face, but I can't help grinning at myself.

6. Barbara tried to keep a straight face, but in the end she just couldn't help laughing.

6. is a online sentence dictionary, on which you can find nice sentences for a large number of words.

7. She looked so ridiculous it was hard to keep a straight face.

8. They couldn't keep a straight face.

9. How Harry managed to keep a straight face during these performances is quite beyond me.

10. And how Henry managed to keep a straight face, I'll never know!

11. Keep a straight face.

12. I couldn't keep a straight face when he dropped his watch in the soup.

13. He sounded so foolish that I could hardly keep a straight face.

14. Nonsense ! How can you say that and keep a straight face?

15. It's hard to keep a straight face when your ankles are being snapped at by a Bichon Frise and a miniature schnauzer.

16. Brian looked ridiculous in leather trousers, and I was desperately trying to keep a straight face.

17. He has such a strange voice that it's difficult to keep a straight face when he's talking.

18. What went through Tom's mind I can't imagine, but he did manage to keep a straight face.

19. When reading some of the competition entries, it was hard to keep a straight face.

20. "I think I've lost that camera you lent me," I said, trying to keep a straight face.

21. He looked so ridiculous -- I don't know how I managed to keep a straight face.

1. Brian looked ridiculous in leather trousers, and I was desperately trying to keep a straight face.