1) Bite off more than one can chew. 

2) Chew your food up thoroughly before you swallow it.

3) This meat is difficult to chew.

4) Chew your food well before swallow.

5) This meat's so tough I can hardly chew it!

6) Don't bite off more than you can chew.

7) Always chew food well before swallowing it.

8) Chew your food well before you swallow it.

9) Chew your food point by point.

10) To "have bitten off more than you can chew" is an idiom that means you have tried to do something which is too difficult for you.

11) Tom likes to have some difficult matter to chew on.

12) Children are always told to chew their food up well.

13) You must chew your food well before you swallow it.

14) I'll chew it over for a few days and let you know my opinion.

15) Americans like to chew gum.

16) You should chew over this thing.

17) Chew your food properly before swallowing it.

18) Let me chew it over for a few days.

19) Babies like to chew something when they're teething.

20) Old men have to chew thoroughly before swallowing.

21) We must chew the matter over this morning.

22) We'll chew on your suggestion.

23) The meat was tough and hard to chew.

24) They don't want to chew the problem over tonight.

25) They pause and chew their pencils.

26) Why don't we chew on it for a while?

27) Would you like some gum to chew?

28) I'll give you till tomorrow to ,(http://sentencedict.com/chew.html)chew it 'over.

29) I'll give you till tomorrow to chew over.

30) After the operation you may find it difficult to chew and swallow.