Similar words: be over, be opposed to, eon, peon, neon, aeon, leon, one-on-one. Meaning: v. appear in a show, on T.V. or radio.
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1. It is best to be on the safe side. 
2. Be on your guard against pickpockets.
3. The semi-final replay will be on Saturday.
4. How long will the cast be on?
5. You can figure on him to be on time.
6. His funeral will be on Thursday at Blackburn Cathedral.
7. Two soldiers must be on guard all night.
8. It was good to be on dry land again after months at sea.
9. A 1200-strong military force will be on hand to monitor the ceasefire.
10. One of his new comedies is to be on TV soon.
11. The final exam for this class will be on May 21st.
12. Given the slightest encouragement, he'd be on his knees swearing eternal devotion.
13. The police warned holidaymakers to be on the watch for car thieves.
14. Her parents are rumoured to be on the verge of splitting up.
15. Let's dress the kids or we'll never be on time.
16. How old will you be on December 31 of this year?
17. The rule is that someone must be on duty at all times.
18. The rest episodes of this TV play will be on next Monday.
19. A whole batch of original drawings will be on sale.
20. We'll have to be on our mettle from the start.
20. Sentencedict.com is a online sentence dictionary, on which you can find nice sentences for a large number of words.
21. The key focus of the marketing mix will be on price and distribution.
22. She should be on the way here by now.
23. My career seemed to be on a downward trajectory.
24. Be on the alert for anyone acting suspiciously.
25. Be on your guard, I conjure you.
26. The men's basketball final will be on Sunday.
27. We'll be on air in three minutes.
28. Lyn always seems to be on a diet.
29. Her luck seems to have taken an upturn / to be on the upturn.
30. If we are to treat with you, it must be on equal terms.